syntax

Author: AArdeev

doc/platform/app/app_roles.rst

@@ -77,8 +77,11 @@ The ``on_event`` callback provides 3 arguments, when it is called:
 - ``config``, which contains the configuration of the role;
 
 - ``key``, which reflects the trigger event:
+
    - ``config.apply`` if the callback was triggered by a configuration update;
+
    - ``box.status`` if it was triggered by the ``box.status`` system event.
+
 - ``value``, which shows and logs the information about the instance status as in the trigger ``box.status`` system event.
 If the callback is triggered by a configuration update, the ``value`` shows the information of the most recent ``box.status`` system event.