Elfa Shelf labeling system

I have a lot of ELFA shelves in the garage and was looking for a way of labeling what is where to help others looking for something or me when I forgot what is in each container. I decided the easiest way is to make something that will snap into the wire frame in the front and to which one can attach address labels that are easily readable (and can be printed on a computer if one wants it to look nice also).