Warwick Passive Tooltip Incorrect

The passive tooltip currently does not say that he has to attack to same target to keep stacking the buff. Although if you hover over the buff he gets, it DOES state that he needs to attack the same target to keep stacking the buff.

It should at least say consecutive hit on the same target.

Hovering over passive: http://i.imgur.com/aXSj6oj.jpg

Hovering over passive buff: http://i.imgur.com/9UJ4lGV.jpg