diff --git a/src/Microsoft.AspNet.JsonPatch/Adapters/ObjectAdapter.cs b/src/Microsoft.AspNet.JsonPatch/Adapters/ObjectAdapter.cs
index 3c472c1a50..42ae4d7222 100644
--- a/src/Microsoft.AspNet.JsonPatch/Adapters/ObjectAdapter.cs
+++ b/src/Microsoft.AspNet.JsonPatch/Adapters/ObjectAdapter.cs
@@ -22,7 +22,9 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         /// </summary>
         /// <param name="contractResolver">The <see cref="IContractResolver"/>.</param>
         /// <param name="logErrorAction">The <see cref="Action"/> for logging <see cref="JsonPatchError{TModel}"/>.</param>
-        public ObjectAdapter(IContractResolver contractResolver, Action<JsonPatchError<TModel>> logErrorAction)
+        public ObjectAdapter(
+            [NotNull] IContractResolver contractResolver,
+            Action<JsonPatchError<TModel>> logErrorAction)
         {
             ContractResolver = contractResolver;
             LogErrorAction = logErrorAction;
@@ -97,8 +99,8 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         /// because "a" does not exist.
         /// </summary>
         /// <param name="operation">The add operation.</param>
-        /// <param name="objectApplyTo">Object to apply the operation to.</param>
-        public void Add(Operation<TModel> operation, TModel objectToApplyTo)
+        /// <param name="objectToApplyTo">Object to apply the operation to.</param>
+        public void Add([NotNull] Operation<TModel> operation, [NotNull] TModel objectToApplyTo)
         {
             Add(operation.path, operation.value, objectToApplyTo, operation);
         }
@@ -107,7 +109,11 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         /// Add is used by various operations (eg: add, copy, ...), yet through different operations;
         /// This method allows code reuse yet reporting the correct operation on error
         /// </summary>
-        private void Add(string path, object value, TModel objectToApplyTo, Operation<TModel> operationToReport)
+        private void Add(
+            [NotNull] string path,
+            object value,
+            [NotNull] TModel objectToApplyTo,
+            [NotNull] Operation<TModel> operationToReport)
         {
             // add, in this implementation, does not just "add" properties - that's
             // technically impossible;  It can however be used to add items to arrays,
@@ -237,8 +243,8 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         /// location; i.e., a location cannot be moved into one of its children.
         /// </summary>
         /// <param name="operation">The move operation.</param>
-        /// <param name="objectApplyTo">Object to apply the operation to.</param>
-        public void Move(Operation<TModel> operation, TModel objectToApplyTo)
+        /// <param name="objectToApplyTo">Object to apply the operation to.</param>
+        public void Move([NotNull] Operation<TModel> operation, [NotNull] TModel objectToApplyTo)
         {
             // get value at from location
             object valueAtFromLocation = null;
@@ -322,8 +328,8 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         /// specified index are shifted one position to the left.
         /// </summary>
         /// <param name="operation">The remove operation.</param>
-        /// <param name="objectApplyTo">Object to apply the operation to.</param>
-        public void Remove(Operation<TModel> operation, TModel objectToApplyTo)
+        /// <param name="objectToApplyTo">Object to apply the operation to.</param>
+        public void Remove([NotNull] Operation<TModel> operation, [NotNull] TModel objectToApplyTo)
         {
             Remove(operation.path, objectToApplyTo, operation);
         }
@@ -332,7 +338,10 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         /// Remove is used by various operations (eg: remove, move, ...), yet through different operations;
         /// This method allows code reuse yet reporting the correct operation on error
         /// </summary>
-        private void Remove(string path, TModel objectToApplyTo, Operation<TModel> operationToReport)
+        private void Remove(
+            [NotNull] string path,
+            [NotNull] TModel objectToApplyTo,
+            [NotNull] Operation<TModel> operationToReport)
         {
             var removeFromList = false;
             var positionAsInteger = -1;
@@ -442,8 +451,8 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         /// for performance reasons (multiple checks of same requirements).
         /// </summary>
         /// <param name="operation">The replace operation.</param>
-        /// <param name="objectApplyTo">Object to apply the operation to.</param>
-        public void Replace(Operation<TModel> operation, TModel objectToApplyTo)
+        /// <param name="objectToApplyTo">Object to apply the operation to.</param>
+        public void Replace([NotNull] Operation<TModel> operation, [NotNull] TModel objectToApplyTo)
         {
             Remove(operation.path, objectToApplyTo, operation);
             Add(operation.path, operation.value, objectToApplyTo, operation);
@@ -470,8 +479,8 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
         ///  the value specified in from for performance reasons (multiple checks of same requirements).
         /// </summary>
         /// <param name="operation">The copy operation.</param>
-        /// <param name="objectApplyTo">Object to apply the operation to.</param>
-        public void Copy(Operation<TModel> operation, TModel objectToApplyTo)
+        /// <param name="objectToApplyTo">Object to apply the operation to.</param>
+        public void Copy([NotNull] Operation<TModel> operation, [NotNull] TModel objectToApplyTo)
         {
             // get value at from location
             object valueAtFromLocation = null;
@@ -610,9 +619,7 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
             }
         }
 
-        private JsonPatchProperty FindPropertyAndParent(
-            object targetObject,
-            string propertyPath)
+        private JsonPatchProperty FindPropertyAndParent(object targetObject, string propertyPath)
         {
             try
             {
@@ -674,7 +681,7 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
             }
         }
 
-        private Type GetIListType([NotNull] Type type)
+        private Type GetIListType(Type type)
         {
             if (IsGenericListType(type))
             {
@@ -692,7 +699,7 @@ namespace Microsoft.AspNet.JsonPatch.Adapters
             return null;
         }
 
-        private bool IsGenericListType([NotNull] Type type)
+        private bool IsGenericListType(Type type)
         {
             if (type.GetTypeInfo().IsGenericType &&
                     type.GetGenericTypeDefinition() == typeof(IList<>))
diff --git a/src/Microsoft.AspNet.JsonPatch/Exceptions/JsonPatchException.cs b/src/Microsoft.AspNet.JsonPatch/Exceptions/JsonPatchException.cs
index 28a1accd05..8fcf2b3e28 100644
--- a/src/Microsoft.AspNet.JsonPatch/Exceptions/JsonPatchException.cs
+++ b/src/Microsoft.AspNet.JsonPatch/Exceptions/JsonPatchException.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNet.JsonPatch.Operations;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.JsonPatch.Exceptions
 {
@@ -27,14 +28,14 @@ namespace Microsoft.AspNet.JsonPatch.Exceptions
 
         }
 
-        public JsonPatchException(JsonPatchError<TModel> jsonPatchError)
+        public JsonPatchException([NotNull] JsonPatchError<TModel> jsonPatchError)
         {
             FailedOperation = jsonPatchError.Operation;
             _message = jsonPatchError.ErrorMessage;
             AffectedObject = jsonPatchError.AffectedObject;
         }
 
-        public JsonPatchException(JsonPatchError<TModel> jsonPatchError, Exception innerException)
+        public JsonPatchException([NotNull] JsonPatchError<TModel> jsonPatchError, Exception innerException)
             : this(jsonPatchError)
         {
             InnerException = innerException;
diff --git a/src/Microsoft.AspNet.JsonPatch/Helpers/JsonPatchProperty.cs b/src/Microsoft.AspNet.JsonPatch/Helpers/JsonPatchProperty.cs
index 8e46af37b7..7ba0c047cc 100644
--- a/src/Microsoft.AspNet.JsonPatch/Helpers/JsonPatchProperty.cs
+++ b/src/Microsoft.AspNet.JsonPatch/Helpers/JsonPatchProperty.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using Microsoft.Framework.Internal;
 using Newtonsoft.Json.Serialization;
 
 namespace Microsoft.AspNet.JsonPatch
@@ -13,7 +14,7 @@ namespace Microsoft.AspNet.JsonPatch
         /// <summary>
         /// Initializes a new instance.
         /// </summary>
-        public JsonPatchProperty(JsonProperty property, object parent)
+        public JsonPatchProperty([NotNull] JsonProperty property, [NotNull] object parent)
         {
             Property = property;
             Parent = parent;
diff --git a/src/Microsoft.AspNet.JsonPatch/JsonPatchDocumentOfT.cs b/src/Microsoft.AspNet.JsonPatch/JsonPatchDocumentOfT.cs
index a8bf5f95a7..0c631461c3 100644
--- a/src/Microsoft.AspNet.JsonPatch/JsonPatchDocumentOfT.cs
+++ b/src/Microsoft.AspNet.JsonPatch/JsonPatchDocumentOfT.cs
@@ -8,6 +8,7 @@ using Microsoft.AspNet.JsonPatch.Adapters;
 using Microsoft.AspNet.JsonPatch.Converters;
 using Microsoft.AspNet.JsonPatch.Helpers;
 using Microsoft.AspNet.JsonPatch.Operations;
+using Microsoft.Framework.Internal;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
 
@@ -31,8 +32,10 @@ namespace Microsoft.AspNet.JsonPatch
             ContractResolver = new DefaultContractResolver();
         }
 
-        // Create from list of operations
-        public JsonPatchDocument(List<Operation<TModel>> operations, IContractResolver contractResolver)
+        // Create from list of operations.
+        public JsonPatchDocument(
+            [NotNull] List<Operation<TModel>> operations,
+            [NotNull] IContractResolver contractResolver)
         {
             Operations = operations;
             ContractResolver = contractResolver;
@@ -42,11 +45,11 @@ namespace Microsoft.AspNet.JsonPatch
         /// Add operation.  Will result in, for example,
         /// { "op": "add", "path": "/a/b/c", "value": [ "foo", "bar" ] }
         /// </summary>
-        /// <typeparam name="TProp">value type</typeparam>
-        /// <param name="path">path</param>
-        /// <param name="value">value</param>
-        /// <returns></returns>
-        public JsonPatchDocument<TModel> Add<TProp>(Expression<Func<TModel, TProp>> path, TProp value)
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="path">The path of the property to add.</param>
+        /// <param name="value">The value to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
+        public JsonPatchDocument<TModel> Add<TProp>([NotNull] Expression<Func<TModel, TProp>> path, TProp value)
         {
             Operations.Add(new Operation<TModel>(
                 "add",
@@ -58,16 +61,15 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Add value to list at given position
+        /// Add value to list at given position.
         /// </summary>
-        /// <typeparam name="TProp">value type</typeparam>
-        /// <param name="path">path</param>
-        /// <param name="value">value</param>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="path">The path of the property to add.</param>
+        /// <param name="value">The value to add.</param>
         /// <param name="position">position</param>
-        /// <returns></returns>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Add<TProp>(
-            Expression<Func<TModel,
-            IList<TProp>>> path,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
             TProp value,
             int position)
         {
@@ -81,13 +83,13 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// At value at end of list
+        /// At value at end of list.
         /// </summary>
-        /// <typeparam name="TProp">value type</typeparam>
-        /// <param name="path">path</param>
-        /// <param name="value">value</param>
-        /// <returns></returns>
-        public JsonPatchDocument<TModel> Add<TProp>(Expression<Func<TModel, IList<TProp>>> path, TProp value)
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="path">The path of the property to add.</param>
+        /// <param name="value">The value to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
+        public JsonPatchDocument<TModel> Add<TProp>([NotNull] Expression<Func<TModel, IList<TProp>>> path, TProp value)
         {
             Operations.Add(new Operation<TModel>(
                 "add",
@@ -102,24 +104,26 @@ namespace Microsoft.AspNet.JsonPatch
         /// Remove value at target location.  Will result in, for example,
         /// { "op": "remove", "path": "/a/b/c" }
         /// </summary>
-        /// <param name="remove"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
-        public JsonPatchDocument<TModel> Remove<TProp>(Expression<Func<TModel, TProp>> path)
+        /// <param name="path">The path of the property to remove.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
+        public JsonPatchDocument<TModel> Remove<TProp>([NotNull] Expression<Func<TModel, TProp>> path)
         {
-            Operations.Add(new Operation<TModel>("remove", ExpressionHelpers.GetPath(path).ToLowerInvariant(), from: null));
+            Operations.Add(
+                new Operation<TModel>("remove", ExpressionHelpers.GetPath(path).ToLowerInvariant(), from: null));
 
             return this;
         }
 
         /// <summary>
-        /// Remove value from list at given position
+        /// Remove value from list at given position.
         /// </summary>
-        /// <typeparam name="TProp">value type</typeparam>
-        /// <param name="path">target location</param>
-        /// <param name="position">position</param>
-        /// <returns></returns>
-        public JsonPatchDocument<TModel> Remove<TProp>(Expression<Func<TModel, IList<TProp>>> path, int position)
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="path">The path of the property to remove.</param>
+        /// <param name="position">The position in the list.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
+        public JsonPatchDocument<TModel> Remove<TProp>(
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
+            int position)
         {
             Operations.Add(new Operation<TModel>(
                 "remove",
@@ -130,12 +134,12 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Remove value from end of list
+        /// Remove value from end of list.
         /// </summary>
-        /// <typeparam name="TProp">value type</typeparam>
-        /// <param name="path">target location</param>
-        /// <returns></returns>
-        public JsonPatchDocument<TModel> Remove<TProp>(Expression<Func<TModel, IList<TProp>>> path)
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="path">The path of the property to remove.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
+        public JsonPatchDocument<TModel> Remove<TProp>([NotNull] Expression<Func<TModel, IList<TProp>>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "remove",
@@ -149,10 +153,10 @@ namespace Microsoft.AspNet.JsonPatch
         /// Replace value.  Will result in, for example,
         /// { "op": "replace", "path": "/a/b/c", "value": 42 }
         /// </summary>
-        /// <param name="path"></param>
-        /// <param name="value"></param>
-        /// <returns></returns>
-        public JsonPatchDocument<TModel> Replace<TProp>(Expression<Func<TModel, TProp>> path, TProp value)
+        /// <param name="path">The path of the property to replace.</param>
+        /// <param name="value">The value to replace.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
+        public JsonPatchDocument<TModel> Replace<TProp>([NotNull] Expression<Func<TModel, TProp>> path, TProp value)
         {
             Operations.Add(new Operation<TModel>(
                 "replace",
@@ -164,15 +168,16 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Replace value in a list at given position
+        /// Replace value in a list at given position.
         /// </summary>
-        /// <typeparam name="TProp">value type</typeparam>
-        /// <param name="path">target location</param>
-        /// <param name="position">position</param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="path">The path of the property to replace.</param>
+        /// <param name="position">The position in the list.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Replace<TProp>(
-            Expression<Func<TModel, IList<TProp>>> path,
-            TProp value, int position)
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
+            TProp value,
+            int position)
         {
             Operations.Add(new Operation<TModel>(
                 "replace",
@@ -184,12 +189,14 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Replace value at end of a list
+        /// Replace value at end of a list.
         /// </summary>
-        /// <typeparam name="TProp">value type</typeparam>
-        /// <param name="path">target location</param>
-        /// <returns></returns>
-        public JsonPatchDocument<TModel> Replace<TProp>(Expression<Func<TModel, IList<TProp>>> path, TProp value)
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="path">The path of the property to replace.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
+        public JsonPatchDocument<TModel> Replace<TProp>(
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
+            TProp value)
         {
             Operations.Add(new Operation<TModel>(
                 "replace",
@@ -204,12 +211,12 @@ namespace Microsoft.AspNet.JsonPatch
         /// Removes value at specified location and add it to the target location.  Will result in, for example:
         /// { "op": "move", "from": "/a/b/c", "path": "/a/b/d" }
         /// </summary>
-        /// <param name="from"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <param name="from">The path of the property to remove.</param>
+        /// <param name="path">The path of the property to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Move<TProp>(
-            Expression<Func<TModel, TProp>> from,
-            Expression<Func<TModel, TProp>> path)
+            [NotNull] Expression<Func<TModel, TProp>> from,
+            [NotNull] Expression<Func<TModel, TProp>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "move",
@@ -220,17 +227,17 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Move from a position in a list to a new location
+        /// Move from a position in a list to a new location.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to remove.</param>
+        /// <param name="positionFrom">The position in the list to remove.</param>
+        /// <param name="path">The path of the property to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Move<TProp>(
-            Expression<Func<TModel, IList<TProp>>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> from,
             int positionFrom,
-            Expression<Func<TModel, TProp>> path)
+            [NotNull] Expression<Func<TModel, TProp>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "move",
@@ -241,16 +248,16 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Move from a property to a location in a list
+        /// Move from a property to a location in a list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to remove.</param>
+        /// <param name="path">The path of the property to add.</param>
+        /// <param name="positionTo">The position in the list to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Move<TProp>(
-            Expression<Func<TModel, TProp>> from,
-            Expression<Func<TModel, IList<TProp>>> path,
+            [NotNull] Expression<Func<TModel, TProp>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
             int positionTo)
         {
             Operations.Add(new Operation<TModel>(
@@ -262,17 +269,18 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Move from a position in a list to another location in a list
+        /// Move from a position in a list to another location in a list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to remove.</param>
+        /// <param name="positionFrom">The position in the list to remove.</param>
+        /// <param name="path">The path of the property to add.</param>
+        /// <param name="positionTo">The position in the list to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Move<TProp>(
-            Expression<Func<TModel, IList<TProp>>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> from,
             int positionFrom,
-            Expression<Func<TModel, IList<TProp>>> path,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
             int positionTo)
         {
             Operations.Add(new Operation<TModel>(
@@ -284,17 +292,17 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Move from a position in a list to the end of another list
+        /// Move from a position in a list to the end of another list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to remove.</param>
+        /// <param name="positionFrom">The position in the list to remove.</param>
+        /// <param name="path">The path of the property to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Move<TProp>(
-            Expression<Func<TModel, IList<TProp>>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> from,
             int positionFrom,
-            Expression<Func<TModel, IList<TProp>>> path)
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "move",
@@ -305,16 +313,15 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Move to the end of a list
+        /// Move to the end of a list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to remove.</param>
+        /// <param name="path">The path of the property to add.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Move<TProp>(
-            Expression<Func<TModel, TProp>> from,
-            Expression<Func<TModel, IList<TProp>>> path)
+            [NotNull] Expression<Func<TModel, TProp>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "move",
@@ -325,15 +332,15 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Copy the value at specified location to the target location.  Willr esult in, for example:
+        /// Copy the value at specified location to the target location.  Will result in, for example:
         /// { "op": "copy", "from": "/a/b/c", "path": "/a/b/e" }
         /// </summary>
-        /// <param name="from"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <param name="from">The path of the property to copy from.</param>
+        /// <param name="path">The path of the property to copy to.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Copy<TProp>(
-            Expression<Func<TModel, TProp>> from,
-            Expression<Func<TModel, TProp>> path)
+            [NotNull] Expression<Func<TModel, TProp>> from,
+            [NotNull] Expression<Func<TModel, TProp>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "copy",
@@ -344,17 +351,17 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Copy from a position in a list to a new location
+        /// Copy from a position in a list to a new location.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to copy from.</param>
+        /// <param name="positionFrom">The position in the list to copy from.</param>
+        /// <param name="path">The path of the property to copy to.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Copy<TProp>(
-            Expression<Func<TModel, IList<TProp>>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> from,
             int positionFrom,
-            Expression<Func<TModel, TProp>> path)
+            [NotNull] Expression<Func<TModel, TProp>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "copy",
@@ -365,16 +372,16 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Copy from a property to a location in a list
+        /// Copy from a property to a location in a list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to copy from.</param>
+        /// <param name="path">The path of the property to copy to.</param>
+        /// <param name="positionTo">The position in the list to copy to.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Copy<TProp>(
-            Expression<Func<TModel, TProp>> from,
-            Expression<Func<TModel, IList<TProp>>> path,
+            [NotNull] Expression<Func<TModel, TProp>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
             int positionTo)
         {
             Operations.Add(new Operation<TModel>(
@@ -386,17 +393,18 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Copy from a position in a list to a new location in a list
+        /// Copy from a position in a list to a new location in a list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to copy from.</param>
+        /// <param name="positionFrom">The position in the list to copy from.</param>
+        /// <param name="path">The path of the property to copy to.</param>
+        /// <param name="positionTo">The position in the list to copy to.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Copy<TProp>(
-            Expression<Func<TModel, IList<TProp>>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> from,
             int positionFrom,
-            Expression<Func<TModel, IList<TProp>>> path,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path,
             int positionTo)
         {
             Operations.Add(new Operation<TModel>(
@@ -408,18 +416,17 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Copy from a position in a list to the end of another list
+        /// Copy from a position in a list to the end of another list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to copy from.</param>
+        /// <param name="positionFrom">The position in the list to copy from.</param>
+        /// <param name="path">The path of the property to copy to.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Copy<TProp>(
-            Expression<Func<TModel,
-            IList<TProp>>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> from,
             int positionFrom,
-            Expression<Func<TModel, IList<TProp>>> path)
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "copy",
@@ -430,16 +437,15 @@ namespace Microsoft.AspNet.JsonPatch
         }
 
         /// <summary>
-        /// Copy to the end of a list
+        /// Copy to the end of a list.
         /// </summary>
-        /// <typeparam name="TProp"></typeparam>
-        /// <param name="from"></param>
-        /// <param name="positionFrom"></param>
-        /// <param name="path"></param>
-        /// <returns></returns>
+        /// <typeparam name="TProp">The value type.</typeparam>
+        /// <param name="from">The path of the property to copy from.</param>
+        /// <param name="path">The path of the property to copy to.</param>
+        /// <returns>The <see cref="JsonPatchDocument{TModel}"/>.</returns>
         public JsonPatchDocument<TModel> Copy<TProp>(
-            Expression<Func<TModel, TProp>> from,
-            Expression<Func<TModel, IList<TProp>>> path)
+            [NotNull] Expression<Func<TModel, TProp>> from,
+            [NotNull] Expression<Func<TModel, IList<TProp>>> path)
         {
             Operations.Add(new Operation<TModel>(
                 "copy",
@@ -449,17 +455,17 @@ namespace Microsoft.AspNet.JsonPatch
             return this;
         }
 
-        public void ApplyTo(TModel objectToApplyTo)
+        public void ApplyTo([NotNull] TModel objectToApplyTo)
         {
             ApplyTo(objectToApplyTo, new ObjectAdapter<TModel>(ContractResolver, logErrorAction: null));
         }
 
-        public void ApplyTo(TModel objectToApplyTo, Action<JsonPatchError<TModel>> logErrorAction)
+        public void ApplyTo([NotNull] TModel objectToApplyTo, Action<JsonPatchError<TModel>> logErrorAction)
         {
             ApplyTo(objectToApplyTo, new ObjectAdapter<TModel>(ContractResolver, logErrorAction));
         }
 
-        public void ApplyTo(TModel objectToApplyTo, IObjectAdapter<TModel> adapter)
+        public void ApplyTo([NotNull] TModel objectToApplyTo, [NotNull] IObjectAdapter<TModel> adapter)
         {
             // apply each operation in order
             foreach (var op in Operations)
diff --git a/src/Microsoft.AspNet.JsonPatch/Operations/Operation.cs b/src/Microsoft.AspNet.JsonPatch/Operations/Operation.cs
index 301b705912..f28357ec7d 100644
--- a/src/Microsoft.AspNet.JsonPatch/Operations/Operation.cs
+++ b/src/Microsoft.AspNet.JsonPatch/Operations/Operation.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using Microsoft.Framework.Internal;
 using Newtonsoft.Json;
 
 namespace Microsoft.AspNet.JsonPatch.Operations
@@ -15,13 +16,13 @@ namespace Microsoft.AspNet.JsonPatch.Operations
 
         }
 
-        public Operation(string op, string path, string from, object value)
+        public Operation([NotNull] string op, [NotNull] string path, string from, object value)
             : base(op, path, from)
         {
             this.value = value;
         }
 
-        public Operation(string op, string path, string from)
+        public Operation([NotNull] string op, [NotNull] string path, string from)
             : base(op, path, from)
         {
 
diff --git a/src/Microsoft.AspNet.JsonPatch/Operations/OperationBase.cs b/src/Microsoft.AspNet.JsonPatch/Operations/OperationBase.cs
index 5655268618..05dd590e89 100644
--- a/src/Microsoft.AspNet.JsonPatch/Operations/OperationBase.cs
+++ b/src/Microsoft.AspNet.JsonPatch/Operations/OperationBase.cs
@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using Microsoft.Framework.Internal;
 using Newtonsoft.Json;
 
 namespace Microsoft.AspNet.JsonPatch.Operations
@@ -31,7 +32,7 @@ namespace Microsoft.AspNet.JsonPatch.Operations
 
         }
 
-        public OperationBase(string op, string path, string from)
+        public OperationBase([NotNull] string op, [NotNull] string path, string from)
         {
             this.op = op;
             this.path = path;
@@ -40,7 +41,7 @@ namespace Microsoft.AspNet.JsonPatch.Operations
 
         public bool ShouldSerializefrom()
         {
-            return (OperationType == Operations.OperationType.Move
+            return (OperationType == OperationType.Move
                 || OperationType == OperationType.Copy);
         }
     }
diff --git a/src/Microsoft.AspNet.JsonPatch/Operations/OperationOfT.cs b/src/Microsoft.AspNet.JsonPatch/Operations/OperationOfT.cs
index 644f44f49c..f28ff7369a 100644
--- a/src/Microsoft.AspNet.JsonPatch/Operations/OperationOfT.cs
+++ b/src/Microsoft.AspNet.JsonPatch/Operations/OperationOfT.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNet.JsonPatch.Adapters;
+using Microsoft.Framework.Internal;
 
 namespace Microsoft.AspNet.JsonPatch.Operations
 {
@@ -13,19 +14,19 @@ namespace Microsoft.AspNet.JsonPatch.Operations
 
         }
 
-        public Operation(string op, string path, string from, object value)
+        public Operation([NotNull] string op, [NotNull] string path, string from, object value)
             : base(op, path, from)
         {
             this.value = value;
         }
 
-        public Operation(string op, string path, string from)
+        public Operation([NotNull] string op, [NotNull] string path, string from)
             : base(op, path, from)
         {
 
         }
 
-        public void Apply(TModel objectToApplyTo, IObjectAdapter<TModel> adapter)
+        public void Apply([NotNull] TModel objectToApplyTo, [NotNull] IObjectAdapter<TModel> adapter)
         {
             switch (OperationType)
             {
@@ -53,7 +54,7 @@ namespace Microsoft.AspNet.JsonPatch.Operations
 
         public bool ShouldSerializevalue()
         {
-            return (OperationType == Operations.OperationType.Add
+            return (OperationType == OperationType.Add
                 || OperationType == OperationType.Replace
                 || OperationType == OperationType.Test);
         }