User blog comment:Emptylord/Archived/PBE Patch Notes (Preseason 3)/@comment-4083774-20121128214007/@comment-82.132.217.233-20121128223221

Only the cleave damage, to the best of my knowledge. It's an on-attack effect rather than an on-hit effect (according to Xyph). Pix and Righteous Fury are the only other examples, try them.