diff --git a/MailAlert.php b/MailAlert.php
index 2686e93..a060506 100644
--- a/MailAlert.php
+++ b/MailAlert.php
@@ -38,6 +38,8 @@ class MailAlert extends ObjectModel
 
 	public $id_lang;
 
+	public $date_add;	
+
 	/**
 	 * @see ObjectModel::$definition
 	 */
@@ -50,7 +52,8 @@ class MailAlert extends ObjectModel
 			'id_product' => array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt', 'required' => true),
 			'id_product_attribute' => array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt', 'required' => true),
 			'id_shop' => array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt', 'required' => true),
-			'id_lang' => array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt', 'required' => true)
+			'id_lang' => array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt', 'required' => true),
+			'date_add' => array('type' => self::TYPE_DATE, 'validate' => 'isDate')
 		),
 	);
 
diff --git a/mailalerts.php b/mailalerts.php
index 3271da5..bca6c66 100644
--- a/mailalerts.php
+++ b/mailalerts.php
@@ -117,6 +117,7 @@ public function install($delete_params = true)
 					`id_product_attribute` int(10) unsigned NOT NULL,
 					`id_shop` int(10) unsigned NOT NULL,
 					`id_lang` int(10) unsigned NOT NULL,
+					`date_add` datetime NOT NULL,
 					PRIMARY KEY  (`id_customer`,`customer_email`,`id_product`,`id_product_attribute`,`id_shop`)
 				) ENGINE='._MYSQL_ENGINE_.' DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci';