diff --git a/htdocs/categories/class/categorie.class.php b/htdocs/categories/class/categorie.class.php
index d846257f68d..237debc95a6 100644
--- a/htdocs/categories/class/categorie.class.php
+++ b/htdocs/categories/class/categorie.class.php
@@ -803,7 +803,7 @@ class Categorie extends CommonObject
 	 *
 	 * @param   string     $type       Type of category ('customer', 'supplier', 'contact', 'product', 'member')
 	 * @param   int        $onlyids    Return only ids of objects (consume less memory)
-	 * @return  mixed                  -1 if KO, array of instance of object if OK
+	 * @return  array|int              -1 if KO, array of instance of object if OK
 	 * @see containsObject
 	 */
 	function getObjectsInCateg($type, $onlyids=0)