Enjoy a free burger for lunch tomorrow (August 16).

Shake Shack is offering 100 free burgers to customers to celebrate the opening of their 100th location.

The first hundred customers to arrive at the Shake Shack in The Shops Buckhead Atlanta will receive a free single Shackburger, the chain’s signature cheeseburger topped with lettuce, tomato and Shacksauce.

The offer will run beginning at 10:30 a.m. It will end when 100 burgers are given away, or at noon.

The only Shake Shack in Georgia is located at 3035 Peachtree Road, Atlanta.

The first Shake Shack opened in 2004. The original kiosk was opened in Madison Square Park in New York City following the success of a hot dog cart in support of Madison Square Park Conservancy’s first art installation.