D.C. dwellers are about to get real cheesy this Sunday.

In celebration of National Cheese Day, Postmates is delivering free grilled cheeses to the first 10,000 Washington D.C. residents who download the delivery app and order on the day, according to a National Today press release.

Postmates partnered with data scientists at NationalToday.com and ranked cities across the U.S. based on the number of grilled cheese deliveries, the frequency of these deliveries and the preference for grilled cheese over other foods.

Washington D.C. ranked number 15 overall out of 40 cities listed. Postmates included D.C. in the promotion to encourage more residents to get cheesy on Sunday.

The promotion works by downloading the app by visiting http://springboard.postmates.com/CHEESELOVE on June 4. Residents can add any grilled cheese to their cart from a local or chain restaurant. They will use the code CHEESELOVE to get it for free.