Valve has announced that Steam games will now be required to disclose the use of kernel-level anti-cheat software on their store pages. This change aims to provide more transparency for players and help them make informed decisions about the games they play. The requirement applies to all games on Steam, including existing ones, and is part of the release process. Kernel-level anti-cheat software can potentially install additional software on a user's system and may require manual removal after uninstalling the game.