diff --git a/websocket-sharp/Net/WebHeaderCollection.cs b/websocket-sharp/Net/WebHeaderCollection.cs
index 56ecd4e3..83f190e8 100644
--- a/websocket-sharp/Net/WebHeaderCollection.cs
+++ b/websocket-sharp/Net/WebHeaderCollection.cs
@@ -730,8 +730,7 @@ namespace WebSocketSharp.Net
     /// The length of <paramref name="value"/> is greater than 65,535 characters.
     /// </exception>
     /// <exception cref="InvalidOperationException">
-    /// The current <see cref="WebHeaderCollection"/> instance does not allow
-    /// the response header.
+    /// This instance does not allow the response header.
     /// </exception>
     public string this[HttpResponseHeader header] {
       get {