Attached to all of my mug rugs is a card with an explanation and washing instructions. Since I did not know what a mug rug was I wanted to make sure that others were informed. I print the cards on card stock and fold it over to make a small card. I then stamp something on the front and attach the card with a small safety pin.
Here is what my mug rug cards say: The Mug Rug has a place for your favorite mug and room for a sweet treat. Machine wash cold Tumble dry
Maybe some day I will come up with a catchy poem to attach. But for now a simple explanation will do fine.