diff --git a/htdocs/modulebuilder/template/class/myobject.class.php b/htdocs/modulebuilder/template/class/myobject.class.php
index e40b6b178e6..7b92e593d4b 100644
--- a/htdocs/modulebuilder/template/class/myobject.class.php
+++ b/htdocs/modulebuilder/template/class/myobject.class.php
@@ -65,6 +65,7 @@ class MyObject extends CommonObject
 	 *  'position' is the sort order of field.
 	 *  'searchall' is 1 if we want to search in this field when making a search from the quick search button.
 	 *  'isameasure' must be set to 1 if you want to have a total on list for this field. Field type must be summable like integer or double(24,8).
+	 *  'css' is the CSS style to use on field. For example: 'maxwidth200'
 	 *  'help' is a string visible as a tooltip on field
 	 *  'comment' is not used. You can store here any text of your choice. It is not used by application.
 	 *  'default' is a default value for creation (can still be replaced by the global setup of default values)