diff --git a/websocket-sharp/Net/Cookie.cs b/websocket-sharp/Net/Cookie.cs
index 48029053..e9862579 100644
--- a/websocket-sharp/Net/Cookie.cs
+++ b/websocket-sharp/Net/Cookie.cs
@@ -66,7 +66,7 @@ namespace WebSocketSharp.Net
   ///     </item>
   ///     <item>
   ///       <term>
-  ///       <see href="http://www.ietf.org/rfc/rfc2965.txt">RFC 2965</see>
+  ///       <see href="https://tools.ietf.org/html/rfc2965">RFC 2965</see>
   ///       </term>
   ///     </item>
   ///   </list>