diff --git a/websocket-sharp/Net/HttpListener.cs b/websocket-sharp/Net/HttpListener.cs
index 9f0a306d..1359cf5c 100644
--- a/websocket-sharp/Net/HttpListener.cs
+++ b/websocket-sharp/Net/HttpListener.cs
@@ -866,6 +866,9 @@ namespace WebSocketSharp.Net
     ///   This listener has not been started or is currently stopped.
     ///   </para>
     /// </exception>
+    /// <exception cref="HttpListenerException">
+    /// This method is canceled.
+    /// </exception>
     /// <exception cref="ObjectDisposedException">
     /// This listener has been closed.
     /// </exception>