Krispy Kreme and Dunkin’ Donuts are celebrating National Doughnut Day on Friday by offering free samples all day long.

At Dunkin’ Donuts, customers can get a free doughnut with the purchase of a beverage. No purchase is necessary at Kripsy Kreme.

National Doughnut Day was established in 1938 by the Salvation Army to raise funds to help people in need.