U.S. Soccer revealed a new policy Saturday 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.

An image of the written bylaw, which was passed by the soccer federation’s board of directors on Feb. 9, was posted on Twitter by Stuart Holden, a former national team player and an analyst for Fox Soccer. Holden attended the federation’s annual general meeting in Hawaii, where the policy was unveiled.

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.”