Removing top cap and stem from Acros headset? I recently bought a used Canyon Ultimate that has an Acros headset on it. I'm trying to remove the stem but for the life of me can't figure out how to take it off. The top cap doesn't have a vertical bolt but instead is just hollow.

I've removed the stem bolts and the stem freely rotates on the steerer tube,but I can't take it off because of the top cap. I've never encountered this type of headset before, surely I must be doing something stupid? 

Picture of what I mean:
Nevermind, yes I am an idiot. You literally just pry the top cap off.