diff --git a/src/Microsoft.AspNetCore.Mvc.Abstractions/Abstractions/ActionDescriptor.cs b/src/Microsoft.AspNetCore.Mvc.Abstractions/Abstractions/ActionDescriptor.cs
index e54f05499c..a1ced7244b 100644
--- a/src/Microsoft.AspNetCore.Mvc.Abstractions/Abstractions/ActionDescriptor.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Abstractions/Abstractions/ActionDescriptor.cs
@@ -36,6 +36,9 @@ namespace Microsoft.AspNetCore.Mvc.Abstractions
         /// </summary>
         public IList<IActionConstraintMetadata> ActionConstraints { get; set; }
 
+        /// <summary>
+        /// The set of parameters associated with this action.
+        /// </summary>
         public IList<ParameterDescriptor> Parameters { get; set; }
 
         /// <summary>
@@ -43,6 +46,9 @@ namespace Microsoft.AspNetCore.Mvc.Abstractions
         /// </summary>
         public IList<ParameterDescriptor> BoundProperties { get; set; }
 
+        /// <summary>
+        /// The set of filters associated with this action.
+        /// </summary>
         public IList<FilterDescriptor> FilterDescriptors { get; set; }
 
         /// <summary>