/macroicon - The category pvpaction has been added.
* This argument is required when setting PvP actions.

This is what was in the patch notes but I can't make any sense of it. I tried a bunch of combinations to get it to work but i'm at my wits end here.

Can anyone tell me how to /macroicon a PvP specific version of an ability? I can get the rest of it to work just fine, it's a simple /pvpac command but what the heck is up with the macroicon command..