Reverberation is not limited to killmonger

I was casually playing 8.1.2 for exploration and went up against war machine boss. When I clicked on that reverberation damage icon, it's saying about killmonger and not about war machine. I know this is one of the ability killmonger has, but come on man, it's the quest boss. You could've made an exception by writing it as war machine and not killmonger