ATLANTA – What’s the secret to the success of Chick-fil-A? Employees who say “please” and “thank you,” Business Insider reports. The fast-food chicken chain ranked first as the most polite chain in the entire restaurant industry, according to QSR Magazine’s yearly drive-thru report released this week.

Chick-fil-A workers smile at customers as well as use polite phrases such as “please,” “thank you” and “my pleasure.” “[Drive-thrus are] all about speed and accuracy, but we know our customers appreciate that we can be nice while being fast and accurate,” said Mark Moraitakis, senior director of hospitality and service design. “Eye contact and smiling go a long way in the drive-thru experience.”

Of course, the chain also trains its store employees to be as customer friendly as possible. For the drive-thru, that includes sending out dedicated teams to handle traffic by taking orders on tablets when the line becomes long.

While some might dismiss such small pleasantries as non-essential, Chick-fil-A has found that workers providing polite service, in addition to being fast and accurate, is a large key to its overall success. Last year, the chain raked in more revenue per location than any other quick-service chain in the country.

This superior customer service has catapulted Chick-fil-A over chains such as Domino’s, KFC and Pizza Hut that have more than twice as many U.S. units. Chick-fil-A credits its success to investing in employee training and only allowing each franchisee to open a single unit.