diff --git a/xml/System/Type.xml b/xml/System/Type.xml
index ddff120b04c..baa371a1741 100644
--- a/xml/System/Type.xml
+++ b/xml/System/Type.xml
@@ -10881,7 +10881,7 @@ GetType(Array).IsAssignableFrom(type)
       </Parameters>
       <Docs>
         <param name="c">The type to compare with the current type.</param>
-        <summary>Determines whether an instance of a specified type can be assigned to a variable of the current type.</summary>
+        <summary>Determines whether an instance of a specified type <paramref name="c" /> can be assigned to a variable of the current type.</summary>
         <returns>
           <see langword="true" /> if any of the following conditions is true:  
   
@@ -10971,9 +10971,21 @@ GetType(Array).IsAssignableFrom(type)
         </Parameter>
       </Parameters>
       <Docs>
-        <param name="targetType">To be added.</param>
-        <summary>To be added.</summary>
-        <returns>To be added.</returns>
+        <param name="targetType">The type to compare with the current type.</param>
+        <summary>Determines whether the current type can be assigned to a variable of the specified <paramref name="targetType" />.</summary>
+        <returns><see langword="true" /> if any of the following conditions is true:  
+  
+-   The current instance and <paramref name="targetType" /> represent the same type.  
+  
+-   The current type is derived either directly or indirectly from <paramref name="targetType" />. The current type is derived directly from <paramref name="targetType" /> if it inherits from <paramref name="targetType" />; the current type is derived indirectly from <paramref name="targetType" /> if it inherits from a succession of one or more classes that inherit from <paramref name="targetType" />.  
+  
+-   <paramref name="targetType" /> is an interface that the current type implements.  
+  
+-   The current type is a generic type parameter, and <paramref name="targetType" /> represents one of the constraints of the current type.  
+  
+-   The current type represents a value type, and <paramref name="targetType" /> represents <c>Nullable&lt;c&gt;</c> (<c>Nullable(Of c)</c> in Visual Basic).  
+  
+ <see langword="false" /> if none of these conditions are true, or if <paramref name="targetType" /> or <see langword="this" /> is <see langword="null" />.</returns>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>