Yum Brands (YUM) is giving out free Taco Bell tacos in January as part of an offer.

The restaurant is offering 1 million free Doritos Locos for mobile app users–the offer kicked off January 1 and it lasts through the month.

The move is in honor of the successful Taco Bell app which has already been downloaded more than 1.4 million times. Free tacos will be given with any other Taco Bell purchase.

The #onlyintheapp deal could end before the month is over due to the 1-million taco limit.

Taco Bell has been testing a number of products lately including a Fritos Taco and a new Sriracha menu.

YUM stock is down 1.2% Tuesday afternoon.

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