diff --git a/websocket-sharp/Server/WebSocketServiceManager.cs b/websocket-sharp/Server/WebSocketServiceManager.cs
index 1915fb54..db261d45 100644
--- a/websocket-sharp/Server/WebSocketServiceManager.cs
+++ b/websocket-sharp/Server/WebSocketServiceManager.cs
@@ -451,9 +451,14 @@ namespace WebSocketSharp.Server
     /// the service to add.
     /// </param>
     /// <param name="initializer">
-    /// An <c>Action&lt;TBehavior&gt;</c> delegate that invokes
-    /// the method used to initialize a new session instance for
-    /// the service or <see langword="null"/> if not needed.
+    ///   <para>
+    ///   An <c>Action&lt;TBehavior&gt;</c> delegate or
+    ///   <see langword="null"/> if not needed.
+    ///   </para>
+    ///   <para>
+    ///   That delegate invokes the method called when initializing
+    ///   a new session instance for the service.
+    ///   </para>
     /// </param>
     /// <typeparam name="TBehavior">
     /// The type of the behavior for the service. It must inherit