User blog comment:Deshiba/Doom/@comment-5593561-20140123192040/@comment-5035765-20140124021338

@deshiba Annie does more damage, so she'd benefit more from a percent increase in damage... kind of like how the more AP you have, the more Rabadon's Deathcap's passive effect is worth

so yeah, Annie would benefit more than usual supports from having Doom