Teens who didn’t know they had to tip made it up to the waiter in a big way.

When a waiter and Imgur user who goes by the name Seminole was left a meager $3.28 tip after waiting on four teenagers, he was justifiably peeved.

He wrote:

“Nothing more frustrating than when I get little to nothing for a tip and the customer is smiling and thanking me profusely as they exit.”

However, what came next surprised him.

Nearly two weeks later, the teens returned to the restaurant with this letter:

Faith in people restored