diff --git a/websocket-sharp/Server/WebSocketServer.cs b/websocket-sharp/Server/WebSocketServer.cs
index 136f59f1..bd2c3788 100644
--- a/websocket-sharp/Server/WebSocketServer.cs
+++ b/websocket-sharp/Server/WebSocketServer.cs
@@ -609,22 +609,32 @@ namespace WebSocketSharp.Server
     }
 
     /// <summary>
-    /// Gets or sets the delegate used to find the credentials for an identity.
+    /// Gets or sets the delegate used to find the credentials for
+    /// an identity.
     /// </summary>
     /// <remarks>
-    /// The set operation does nothing if the server has already started or
-    /// it is shutting down.
+    ///   <para>
+    ///   The set operation does nothing if the server has already
+    ///   started or it is shutting down.
+    ///   </para>
+    ///   <para>
+    ///   No credentials are found if the method invoked by
+    ///   the delegate returns <see langword="null"/> or
+    ///   the value is <see langword="null"/>.
+    ///   </para>
     /// </remarks>
     /// <value>
     ///   <para>
     ///   A <c>Func&lt;IIdentity, NetworkCredential&gt;</c> delegate or
-    ///   <see langword="null"/> if not needed. The default value is
-    ///   <see langword="null"/>.
+    ///   <see langword="null"/> if not needed.
     ///   </para>
     ///   <para>
     ///   That delegate invokes the method called for finding
     ///   the credentials used to authenticate a client.
     ///   </para>
+    ///   <para>
+    ///   The default value is <see langword="null"/>.
+    ///   </para>
     /// </value>
     public Func<IIdentity, NetworkCredential> UserCredentialsFinder {
       get {