How do I change my fondant to chocolate fondant?

I don't really want a chocolate fondant recipe. I have a great recipe already. I just want to know how much cocoa powder to add to make it chocolate and how to adjust it Here is my recipe http://allrecipes.com/Recipe/Rolled-FondHow do I change my fondant to chocolate fondant?Replace 1/4 cup of the Powdered sugar with 1/4 cup cocoa powder. But to honest rolled fondant is not very tasty no matter what you add to it. Most people tend to peel it off there pieces of cake after the first bitter bite.How do I change my fondant to chocolate fondant?Is this one of those French dishes? I haven't the foggiest.