diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 7651a3db..6286f27f 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -632,11 +632,20 @@ namespace WebSocketSharp.Server
     }
 
     /// <summary>
-    /// Gets or sets the wait time for the response to the WebSocket Ping or Close.
+    /// Gets or sets the time to wait for the response to
+    /// the WebSocket Ping or Close.
     /// </summary>
+    /// <remarks>
+    /// The set operation does nothing if the server has already
+    /// started or it is shutting down.
+    /// </remarks>
     /// <value>
-    /// A <see cref="TimeSpan"/> that represents the wait time. The default value is
-    /// the same as 1 second.
+    ///   <para>
+    ///   A <see cref="TimeSpan"/> to wait for the response.
+    ///   </para>
+    ///   <para>
+    ///   The default value is the same as 1 second.
+    ///   </para>
     /// </value>
     /// <exception cref="ArgumentException">
     /// The value specified for a set operation is zero or less.