The NFL, NBA, MLB, and NHL are among U.S. professional sports leagues and media entities that just announced the formation of the Coalition for Responsible Sports Betting Advertising.

The group, which is promoting six core principles needed “to implement and maintain consumer protection policies,” also includes the WNBA, MLS, and NASCAR, with NBCUniversal and Fox Sports as founding media partners.

“As the legalization of sports betting spreads nationwide, we feel it is critical to establish guardrails around how sports betting should be advertised to consumers across the United States,” the coalition said in a joint statement. “Each member of the coalition feels a responsibility to ensure sports betting advertising is not only targeted to an appropriate audience, but also that the message is thoughtfully crafted and carefully delivered.”

As widespread sports wagering in the United States nears its fifth anniversary, there are currently 29 states and jurisdictions with commercial sports wagering available. There are also a handful of states with sports betting available through tribal gaming.