An entry dated Dec. 6 references Riot Games' free-to-play multiplayer online battle arena. It appears in the Open Steamworks Content Description Record Database, a public registry for Valve's digital distribution service. The listing shows English, French, German and Spanish versions of League of Legends, which is currently available for download through the game's official website.
Earlier this week, Riot Games revealed that it had banned a League of Legends player for one year for "persistent toxic behavior." In October, Polygon interviewed developers at Riot about their initiative to curb "toxic" behavior in the game.
We've reached out to Valve for comment and will update this article with any information we receive.