Nintendo may be making a Super NES-style wireless controller for Nintendo Switch, based on images from a recent filing with the U.S. Federal Communications Commission.

The FCC filing was spotted by a member of the ResetEra forums and features a drawing of the back of the wireless device. The silhouette is unmistakably a SNES controller, and the model number and FCC ID include the letters HAC, which is used in Nintendo’s model numbers for the Switch hardware and accessories.

Nintendo’s filing may provide further evidence for the long-rumored addition of Super NES games for Nintendo Switch Online, which currently offers subscribers a growing list of classic NES games. In January, a member of the modding community uncovered evidence of SNES titles for Nintendo Switch Online, including games like Super Mario Kart, Pilot Wings, The Legend of Zelda: A Link to the Past, and Super Mario World. The addition of SNES games for Nintendo Switch Online would be a welcome feature, as evidenced by this month’s deep-cut additions to the service: Kung-Fu Heroes and Vice: Project Doom.

Nintendo currently sells wireless controllers for the Switch based on the design of the NES controller. Those controllers are available exclusively to Nintendo Switch Online subscribers.

Polygon has reached out to Nintendo for comment on the filing and will update when the company responds.