diff --git a/src/FileProviders/Manifest.MSBuildTask/src/Entry.cs b/src/FileProviders/Manifest.MSBuildTask/src/Entry.cs
index 40c815fde4..1a7f18bef8 100644
--- a/src/FileProviders/Manifest.MSBuildTask/src/Entry.cs
+++ b/src/FileProviders/Manifest.MSBuildTask/src/Entry.cs
@@ -8,7 +8,8 @@ using System.Diagnostics;
 namespace Microsoft.Extensions.FileProviders.Embedded.Manifest.Task.Internal
 {
     /// <summary>
-    /// This type is for internal uses only and is not meant to be consumed by any other library.
+    /// This API supports infrastructure and is not intended to be used
+    /// directly from your code. This API may change or be removed in future releases.
     /// </summary>
     [DebuggerDisplay("{Name,nq}")]
     public class Entry : IEquatable<Entry>
diff --git a/src/Localization/Localization/src/Internal/AssemblyWrapper.cs b/src/Localization/Localization/src/Internal/AssemblyWrapper.cs
index b0c3c2bce1..11e118e326 100644
--- a/src/Localization/Localization/src/Internal/AssemblyWrapper.cs
+++ b/src/Localization/Localization/src/Internal/AssemblyWrapper.cs
@@ -1,4 +1,4 @@
-// Copyright (c) .NET Foundation. All rights reserved. 
+// 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 System;
@@ -7,6 +7,10 @@ using System.Reflection;
 
 namespace Microsoft.Extensions.Localization.Internal
 {
+    /// <summary>
+    /// This API supports infrastructure and is not intended to be used
+    /// directly from your code. This API may change or be removed in future releases.
+    /// </summary>
     public class AssemblyWrapper
     {
         public AssemblyWrapper(Assembly assembly)
diff --git a/src/Localization/Localization/src/Internal/IResourceStringProvider.cs b/src/Localization/Localization/src/Internal/IResourceStringProvider.cs
index b74bd80eda..157e8e976e 100644
--- a/src/Localization/Localization/src/Internal/IResourceStringProvider.cs
+++ b/src/Localization/Localization/src/Internal/IResourceStringProvider.cs
@@ -1,11 +1,15 @@
-// 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. 
+// 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 System.Collections.Generic;
 using System.Globalization;
 
 namespace Microsoft.Extensions.Localization.Internal
 {
+    /// <summary>
+    /// This API supports infrastructure and is not intended to be used
+    /// directly from your code. This API may change or be removed in future releases.
+    /// </summary>
     public interface IResourceStringProvider
     {
         IList<string> GetAllResourceStrings(CultureInfo culture, bool throwOnMissing);
diff --git a/src/Localization/Localization/src/Internal/ResourceManagerStringProvider.cs b/src/Localization/Localization/src/Internal/ResourceManagerStringProvider.cs
index 9eef8c84a8..62250938c8 100644
--- a/src/Localization/Localization/src/Internal/ResourceManagerStringProvider.cs
+++ b/src/Localization/Localization/src/Internal/ResourceManagerStringProvider.cs
@@ -1,5 +1,5 @@
-// 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. 
+// 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 System.Collections;
 using System.Collections.Generic;
@@ -9,6 +9,10 @@ using System.Resources;
 
 namespace Microsoft.Extensions.Localization.Internal
 {
+    /// <summary>
+    /// This API supports infrastructure and is not intended to be used
+    /// directly from your code. This API may change or be removed in future releases.
+    /// </summary>
     public class ResourceManagerStringProvider : IResourceStringProvider
     {
         private readonly IResourceNamesCache _resourceNamesCache;