How do I type on the back of a drawing or illustration?

I am not that sure about it, I have never been asked to do that. But maybe you can type your description on the computer and glue it on the back of your drawing, or staple it. I am thinking you are not a computer "geek" so you would not know but there is probably some way to enter your paper to the computer and write on it. But thats a bit complicated, So i would just do it that first way and see if its good, or if you get a better answer. Hope This Helped!