U.S. Soccer revealed a new policy that will require anyone on a national team to “stand respectfully” during national anthems.

The penalties for a failure to follow the policy were unclear.

Neil Buethe, director of communications for U.S. Soccer, confirmed in an email that the policy had been approved.

The posted image of the bylaw read, “All persons representing a Federation national team shall stand respectfully during the playing of the national anthems at any event in which the Federation is represented.”

Holden also said on Twitter that Sunil Gulati, the president of U.S. Soccer, had said that the penalties for violating the policy would be determined case by case.

The new policy came after Megan Rapinoe, a member of the national team and of the Seattle Reign in the National Women’s Soccer League, knelt during the anthem at least twice last year.