As travelers adjust to new identification requirements for flying in the U.S., TSA has some advice for fliers who may be confused: Your Costco membership card does not count as a REAL ID.

While a Costco membership might save you some dollars in your weekly grocery shop, one thing it won’t do is get you through airport security. The Transportation Security Agency has issued a statement clarifying that a Costco card cannot be used as valid ID when flying domestic.