Caffeine lovers may want to tweak their morning coffee routines on Saturday, September 29: The date marks National Coffee Day, and finding a free cup of the drink will be easy as long as you know where to look.

One of the biggest chains celebrating the occasion with a special coffee offer is Dunkin' Donuts. On Saturday, customers who purchase a hot coffee from participating Dunkin' locations can receive an extra hot coffee of the same size or smaller at no additional cost. The deal includes regular coffee options as well as special, seasonal flavors like pumpkin and maple pecan.

Cumberland Farms is offering a free beverage promotion of its own. Customers who text FREECOFFEE to 64827 will receive a digital coupon good for a free tea, cappuccino, hot chocolate, or hot or iced coffee of any size to use on September 29. Customers who miss out on that opportunity will have the chance to snag free Cumberland Farms coffee next month, when the chain has two free coffee Fridays in October (on the 12th and 26th).

You can also find free coffee this weekend without jumping through any hoops to get it. At Krispy Kreme, customers will get a complimentary coffee of any size on National Coffee Day just for walking in. The doughnut chain is also celebrating the holiday with special coffee-flavored doughnuts available for one week only starting September 24, and doughnut-flavored coffee—a permanent new addition to the menu.

If you need an outlet for all that caffeine-fueled energy on Saturday, why not take some time to learn about the beloved beverage. Here are some quick coffee facts to go with your free cups of java.

[h/t Extra Crispy]