diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index cd1fae53e34..473f50b16d7 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -422,8 +422,8 @@ abstract class CommonObject
 
 	// Dates
 	/**
-	 * @var int		Date of creation
-	 */
+     * @var integer|string date_creation
+     */
 	public $date_creation;