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Post in the forum. It needs a free account, and it is read. Say which page, what it shows, and what you expected — a link to a match or to Riot's own patch notes makes a correction quick to check.

Useful things to send: a number that disagrees with the game, a champion, trait or item that is missing or changed after a patch, or a tool that breaks.

If you hold rights in something shown here and want it removed, say so in the forum with a link to the page. Requests are acted on promptly.