diff --git a/xml/System.Runtime.InteropServices/Marshal.xml b/xml/System.Runtime.InteropServices/Marshal.xml
index 1ea30929c89..187aebc94b2 100644
--- a/xml/System.Runtime.InteropServices/Marshal.xml
+++ b/xml/System.Runtime.InteropServices/Marshal.xml
@@ -4479,6 +4479,7 @@ There is a difference in the behavior of the `GetLastWin32Error` method on .NET
   
  ]]></format>
         </remarks>
+        <exception cref="T:SystemArgumentNullException"><paramref name="pUnk" /> is <see cref="F:System.IntPtr.Zero" />.</exception>
         <permission cref="T:System.Security.SecurityCriticalAttribute">requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.</permission>
         <altmember cref="M:System.Runtime.InteropServices.Marshal.AddRef(System.IntPtr)" />
         <altmember cref="M:System.Runtime.InteropServices.Marshal.Release(System.IntPtr)" />
@@ -12094,4 +12095,4 @@ public static void ThrowExceptionForHR(interrorCode,IntPtrerrorInfo)
       </Docs>
     </Member>
   </Members>
-</Type>
\ No newline at end of file
+</Type>