diff --git a/websocket-sharp/Ext.cs b/websocket-sharp/Ext.cs
index 2fe85d54..181d5ce1 100644
--- a/websocket-sharp/Ext.cs
+++ b/websocket-sharp/Ext.cs
@@ -1402,8 +1402,7 @@ namespace WebSocketSharp
     }
 
     /// <summary>
-    /// Determines whether the specified <see cref="string"/> is
-    /// a predefined scheme.
+    /// Determines whether the specified string is a predefined scheme.
     /// </summary>
     /// <returns>
     /// <c>true</c> if <paramref name="value"/> is a predefined scheme;