Forum:Spell Vanishing doesn't shuffle?

A friend of mine who's been playing yugioh for a while used spell vanishing on me. I read the card and let him have his way with my deck, but then said that spell vanishing makes no mention of me shuffling my deck. Is this right or errata'd in some way? Do I really have to play my deck where he now knows everything I'm going to draw until I pull a card to shuffle my deck with?