diff --git a/websocket-sharp/Net/HttpListenerRequest.cs b/websocket-sharp/Net/HttpListenerRequest.cs
index 4079da7c..63f1870f 100644
--- a/websocket-sharp/Net/HttpListenerRequest.cs
+++ b/websocket-sharp/Net/HttpListenerRequest.cs
@@ -367,7 +367,13 @@ namespace WebSocketSharp.Net
     /// Gets the query string included in the request.
     /// </summary>
     /// <value>
-    /// A <see cref="NameValueCollection"/> that contains the query string parameters.
+    ///   <para>
+    ///   A <see cref="NameValueCollection"/> that contains the query
+    ///   parameters.
+    ///   </para>
+    ///   <para>
+    ///   An empty collection if not included.
+    ///   </para>
     /// </value>
     public NameValueCollection QueryString {
       get {