diff --git a/ApnsPHP/Message.php b/ApnsPHP/Message.php
index 5be22af3..b48667cd 100644
--- a/ApnsPHP/Message.php
+++ b/ApnsPHP/Message.php
@@ -43,6 +43,7 @@ class ApnsPHP_Message
 	protected $_sText; /**< @type string Alert message to display to the user. */
 	protected $_nBadge; /**< @type integer Number to badge the application icon with. */
 	protected $_sSound; /**< @type string Sound to play. */
+	protected $_sCategory; /**< @type string notification category. */
 	protected $_bContentAvailable; /**< @type boolean True to initiates the Newsstand background download. @see http://tinyurl.com/ApplePushNotificationNewsstand */
 
 	protected $_aCustomProperties; /**< @type mixed Custom properties container. */