Classic Possible issue with Outlaw 2-set bonus?

The two-piece set bonus read as:Dispatch increases the damage of your next Sinister Strike or Ambush by 8% per combo point spent.However, when you get the Vicious Follow-Up buff, that tool tip reads as:Sinister Strike and Ambush critical strike chance increased by 8%.Which is it? via /r/wow https://ift.tt/B13HMsW