Board Thread:League of Legends discussion/@comment-5731482-20140508130849/@comment-24917590-20140508141515

It's not a bug... its 120% of BONUS ad, not Total Ad.. J4 have a 50 base ad + 3.4 base ad/level... so.. If you're on level 6 50+3,4*(level-1)= 67 BASE AD.

100-67= 33

33+120% = 39,6 -> +40 Bonus damage on the skill =D