Walmart, the world’s largest retailer, said Friday that it won’t require vaccinated shoppers or workers to wear a mask in its U.S. stores, unless state or local laws say otherwise.  

Vaccinated shoppers can go maskless immediately, the company said. Vaccinated workers can stop wearing them on May 18. As an incentive, Walmart said it is offering workers $75 if they prove they’ve been vaccinated.  

Walmart said it won’t ask shoppers if they’ve been vaccinated.

Workers, however, will need to tell the company if they’ve been vaccinated in order to go maskless.