Paladin's Blast minimum critical damage

I couldn't remember what update they added 20% minimum critical damage to Blast so i checked the Ultimate Skill tables and it seems it popped out of no where during the Justice update :f6:
I've been looking at patch notes and can't find where it was actually added, can anyone help me out here if they have a clue?
Or was this a silent addition they didn't even bother mentioning? because it doesn't show up in my skill description anyways (in-game)