Coffee and donuts pair together perfectly, which is why many donut shops will be celebrating National Coffee Day when it takes place on Saturday, September 29.

The latest to announce a special deal is Duck Donuts. On National Coffee Day, the growing donut chain will offer a free, small hot coffee with any purchase. The deal will be available at all Duck Donuts locations nationwide.

“Duck Donuts is always looking for entertaining ways to engage its customers, whether it’s celebrating micro-holidays such as National Coffee Day, or with unique limited-time flavors. Since the majority of our sales come from donuts, National Coffee Day provides an opportunity to sample our great coffee to customers, the perfect complement to a donut,” says Russ DiGilio, founder and owner of Duck Donuts Franchising Company.

As DiGilio says, the hot coffee is a perfect pairing with Duck Donuts’ numerous donut flavors. This is especially true for the latest additions to the menu that celebrate the change in seasons. Two new toppings, chopped apple, and a streusel, are now available to add extra crunch to its cake donuts.