Render baking problem

Render baking - sounds like a great feature, but I always get this message when trying to bake:
Error, no images found to bake to.
I’m sure I’ll figure it out eventually, and I’m probably missing something obvious…
But if anybody knows… thanx.

Did you unwrap your mesh? Did you assign an image in the UV-Image Editor?

Oooook, I got it. I didn’t know you had to ‘assign an image’. (I also didn’t know you could do that, but I figured it out.) Thanks for the help.