* Subscribes to an event
* @param id The ID of the event (can be zero)
* @param obj The subscriber object
- * @param return The ID of the event; or zero if failed to subscribe
+ * @return The ID of the event; or zero if failed to subscribe
*
* This function subscribes to an event identified by the ID value. Every object that wants to
* receive specific events, needs to subscribe to them.