diff --git a/websocket-sharp/Net/HttpListenerPrefixCollection.cs b/websocket-sharp/Net/HttpListenerPrefixCollection.cs
index 4c3e038d..cc70d2ff 100644
--- a/websocket-sharp/Net/HttpListenerPrefixCollection.cs
+++ b/websocket-sharp/Net/HttpListenerPrefixCollection.cs
@@ -116,11 +116,16 @@ namespace WebSocketSharp.Net
     #region Public Methods
 
     /// <summary>
-    /// Adds the specified <paramref name="uriPrefix"/> to the collection.
+    /// Adds the specified URI prefix to the collection.
     /// </summary>
     /// <param name="uriPrefix">
-    /// A <see cref="string"/> that represents the URI prefix to add. The prefix must be
-    /// a well-formed URI prefix with http or https scheme, and must end with a <c>'/'</c>.
+    ///   <para>
+    ///   A <see cref="string"/> that specifies the URI prefix to add.
+    ///   </para>
+    ///   <para>
+    ///   It must be a well-formed URI prefix with http or https scheme,
+    ///   and must end with a '/'.
+    ///   </para>
     /// </param>
     /// <exception cref="ArgumentNullException">
     /// <paramref name="uriPrefix"/> is <see langword="null"/>.
@@ -129,7 +134,8 @@ namespace WebSocketSharp.Net
     /// <paramref name="uriPrefix"/> is invalid.
     /// </exception>
     /// <exception cref="ObjectDisposedException">
-    /// The <see cref="HttpListener"/> associated with this collection is closed.
+    /// The <see cref="HttpListener"/> instance associated with this collection
+    /// is closed.
     /// </exception>
     public void Add (string uriPrefix)
     {