Q: delete acces

Hi,

I've come with a pretty bad thing from syncing my iphone (5) to my computer (iTunes). The fact is that I have 2 computer: an mac pro and a macbook pro mid 2012. The problem is that, unfortunately, i've authorized both my mac pro and my macbook to have access to my iphone content. Since i'm pretty much always on the fly and carrying my macbook with me, and that I can only sync my iphone with one computer (content get deleted and rewrited when I sync from one computer to another) I figure out that it would be much convenient that only my macbook pro get involved when coming to sync my itunes library to my iphone. But now, I want to delete (or remove) access of my mac pro to my iphone. How am I suppose to do that?

sincerely yours,

Simon