confused about actions returning 'proceed' and Javadoc

[Tom Zeller]

So ... actions don't typically return 'proceed' if they complete
successfully, instead they return null, that's why the last expression
evaluated in an action-state is usually :

 <evaluate expression="'proceed'" />

Consequently, shouldn't the Javadoc for such an action not contain :

  * @event {@link org.opensaml.profile.action.EventIds#PROCEED_EVENT_ID}

since 'proceed' is not actually returned ?