Magical Knack: You were raised, either wholly or in part, by a magical creature, either after it found you abandoned in the woods or because your parents often left you in the care of a magical minion. This constant exposure to magic has made its mysteries easy for you to understand, even when you turn your mind to other devotions and tasks.
Benefit: Pick a class when you gain this trait—your caster level in that class gains a +2 trait bonus as long as this bonus doesn't raise your caster level above your current Hit Dice.
Im not sure if this trait works, I added it too my arcanist, but from how I interpret what it does, is to raise your caster level by two but not over your HD? how can I tell if its working