[NTG-context] CMYK Color profile

Hello everyone, I'm about creating a DIN Lang Folder brochure with ConTEXt. I got everything set up the way I'd like it to. Now that I'm done with the work, I've been told the output pdf should have a CMYK Color profile embedded for the on demand printing service to be able to deal with the file... I am unsure what steps I have to take to make my output pdf compliant with CMYK. I don't even know how I could verify it does indeed have CMYK. Evince doesn't seem to show that info... So if anybdy of you could give me some hints, that's be wonderful. Cheers De Benny