What the heck this parameter is doing!?

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@10054 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/JobProperty.java

@@ -61,6 +61,9 @@ public abstract class JobProperty<J extends Job<?,?>> implements Describable<Job
     /**
      * {@link Action} to be displayed in the job page.
      *
+     * @param job
+     *      Always the same as {@link #owner} but passed in anyway for backward compatibility (I guess.)
+     *      You really need not use this value at all.
      * @return
      *      null if there's no such action.
      * @since 1.102