diff --git a/Src/Newtonsoft.Json.Tests/Serialization/JsonSerializerTest.cs b/Src/Newtonsoft.Json.Tests/Serialization/JsonSerializerTest.cs
index 3cfc3a8e..005e3d7f 100644
--- a/Src/Newtonsoft.Json.Tests/Serialization/JsonSerializerTest.cs
+++ b/Src/Newtonsoft.Json.Tests/Serialization/JsonSerializerTest.cs
@@ -69,7 +69,6 @@ using Newtonsoft.Json.Utilities;
 using System.Reflection;
 #if !NET20 && !SILVERLIGHT
 using System.Xml.Linq;
-using System.Text.RegularExpressions;
 using System.Collections.Specialized;
 using System.Linq.Expressions;
 #endif
@@ -10192,6 +10191,11 @@ Parameter name: value",
       Domain = samAccountName.Split('\\')[0];
       UserName = samAccountName.Split('\\')[1];
     }
+
+    public DirectoryAccount()
+    {
+      _additionalData = new Dictionary<string, JToken>();
+    }
   }
 
 #if !NETFX_CORE
diff --git a/Src/Newtonsoft.Json/JsonConvert.cs b/Src/Newtonsoft.Json/JsonConvert.cs
index 847d7dff..5fa341c9 100644
--- a/Src/Newtonsoft.Json/JsonConvert.cs
+++ b/Src/Newtonsoft.Json/JsonConvert.cs
@@ -940,7 +940,7 @@ namespace Newtonsoft.Json
     }
 
     /// <summary>
-    /// Serializes the XML node to a JSON string using formatting and omits the root object if <see cref="omitRootObject"/> is <c>true</c>.
+    /// Serializes the XML node to a JSON string using formatting and omits the root object if <paramref name="omitRootObject"/> is <c>true</c>.
     /// </summary>
     /// <param name="node">The node to serialize.</param>
     /// <param name="formatting">Indicates how the output is formatted.</param>
@@ -964,7 +964,7 @@ namespace Newtonsoft.Json
     }
 
     /// <summary>
-    /// Deserializes the XmlNode from a JSON string nested in a root elment specified by <see cref="deserializeRootElementName"/>.
+    /// Deserializes the XmlNode from a JSON string nested in a root elment specified by <paramref name="deserializeRootElementName"/>.
     /// </summary>
     /// <param name="value">The JSON string.</param>
     /// <param name="deserializeRootElementName">The name of the root element to append when deserializing.</param>
@@ -975,7 +975,7 @@ namespace Newtonsoft.Json
     }
 
     /// <summary>
-    /// Deserializes the XmlNode from a JSON string nested in a root elment specified by <see cref="deserializeRootElementName"/>
+    /// Deserializes the XmlNode from a JSON string nested in a root elment specified by <paramref name="deserializeRootElementName"/>
     /// and writes a .NET array attribute for collections.
     /// </summary>
     /// <param name="value">The JSON string.</param>
@@ -1018,7 +1018,7 @@ namespace Newtonsoft.Json
     }
 
     /// <summary>
-    /// Serializes the <see cref="XNode"/> to a JSON string using formatting and omits the root object if <see cref="omitRootObject"/> is <c>true</c>.
+    /// Serializes the <see cref="XNode"/> to a JSON string using formatting and omits the root object if <paramref name="omitRootObject"/> is <c>true</c>.
     /// </summary>
     /// <param name="node">The node to serialize.</param>
     /// <param name="formatting">Indicates how the output is formatted.</param>
@@ -1042,7 +1042,7 @@ namespace Newtonsoft.Json
     }
 
     /// <summary>
-    /// Deserializes the <see cref="XNode"/> from a JSON string nested in a root elment specified by <see cref="deserializeRootElementName"/>.
+    /// Deserializes the <see cref="XNode"/> from a JSON string nested in a root elment specified by <paramref name="deserializeRootElementName"/>.
     /// </summary>
     /// <param name="value">The JSON string.</param>
     /// <param name="deserializeRootElementName">The name of the root element to append when deserializing.</param>
@@ -1053,7 +1053,7 @@ namespace Newtonsoft.Json
     }
 
     /// <summary>
-    /// Deserializes the <see cref="XNode"/> from a JSON string nested in a root elment specified by <see cref="deserializeRootElementName"/>
+    /// Deserializes the <see cref="XNode"/> from a JSON string nested in a root elment specified by <paramref name="deserializeRootElementName"/>
     /// and writes a .NET array attribute for collections.
     /// </summary>
     /// <param name="value">The JSON string.</param>
diff --git a/Src/Newtonsoft.Json/JsonExtensionDataAttribute.cs b/Src/Newtonsoft.Json/JsonExtensionDataAttribute.cs
index 48272f93..c6b25c95 100644
--- a/Src/Newtonsoft.Json/JsonExtensionDataAttribute.cs
+++ b/Src/Newtonsoft.Json/JsonExtensionDataAttribute.cs
@@ -3,14 +3,31 @@
 namespace Newtonsoft.Json
 {
   /// <summary>
-  /// Instructs the <see cref="JsonSerializer"/> to populate properties with no matching class member onto the specified collection.
+  /// Instructs the <see cref="JsonSerializer"/> to deserialize properties with no matching class member into the specified collection
+  /// and write values during serialization.
   /// </summary>
   [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)]
   public class JsonExtensionDataAttribute : Attribute
   {
+    /// <summary>
+    /// Gets or sets a value that indicates whether to write extension data when serializing the object.
+    /// </summary>
+    /// <value>
+    /// 	<c>true</c> to write extension data when serializing the object; otherwise, <c>false</c>. The default is <c>true</c>.
+    /// </value>
     public bool WriteData { get; set; }
+
+    /// <summary>
+    /// Gets or sets a value that indicates whether to read extension data when deserializing the object.
+    /// </summary>
+    /// <value>
+    /// 	<c>true</c> to read extension data when deserializing the object; otherwise, <c>false</c>. The default is <c>true</c>.
+    /// </value>
     public bool ReadData { get; set; }
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="JsonExtensionDataAttribute"/> class.
+    /// </summary>
     public JsonExtensionDataAttribute()
     {
       WriteData = true;