Chipotle restaurants are offering customers an incentive to buy gift cards for the holidays -- free food on your next visit.

For every $30 you spend in Chipotle gift cards, you'll get a free burrito, burrito bowl, salad or order of tacos.

But whatever you do, keep your receipt! That's your ticket to your free food. You must present the receipt of your gift card purchase to eat free.

The deal is good through Dec. 31. And you have until Jan. 31 to get your free burrito.