Rob McElhenney, soon to be known as Rob Mac, is defending the decision to change his last name. In a recent post on X, McElhenney shared a brief video explaining why he abridged his last name for those still scratching their heads over the news.

Specifically, that It’s Always Sunny In Philadelphia and Mythic Quest co-creator Rob McElhenney had filed paperwork to legally change his name to “Rob Mac,” acting on a re-branding he’d floated a few weeks earlier in a Variety profile of himself and wife Kaitlin Olson.