diff --git a/websocket-sharp/Net/HttpListenerRequest.cs b/websocket-sharp/Net/HttpListenerRequest.cs
index fbf1c2f3..4a1ebaa0 100644
--- a/websocket-sharp/Net/HttpListenerRequest.cs
+++ b/websocket-sharp/Net/HttpListenerRequest.cs
@@ -476,10 +476,11 @@ namespace WebSocketSharp.Net
     /// </summary>
     /// <value>
     ///   <para>
-    ///   A <see cref="Uri"/> from the value of the Referer header.
+    ///   A <see cref="Uri"/> converted from the value of the Referer header.
     ///   </para>
     ///   <para>
-    ///   <see langword="null"/> if the Referer header is not present.
+    ///   <see langword="null"/> if the Referer header is not present or
+    ///   the conversion has failed.
     ///   </para>
     /// </value>
     public Uri UrlReferrer {