diff --git a/websocket-sharp/Server/WebSocketServiceManager.cs b/websocket-sharp/Server/WebSocketServiceManager.cs
index b2921d86..553bb19d 100644
--- a/websocket-sharp/Server/WebSocketServiceManager.cs
+++ b/websocket-sharp/Server/WebSocketServiceManager.cs
@@ -481,7 +481,7 @@ namespace WebSocketSharp.Server
     /// </exception>
     /// <exception cref="ArgumentException">
     ///   <para>
-    ///   <paramref name="path"/> is empty.
+    ///   <paramref name="path"/> is an empty string.
     ///   </para>
     ///   <para>
     ///   -or-