While any user (logged-in or not) can revert a page to an earlier version, users with rollback and administrators have a faster, automated reversion tool to help them revert vandalism. When looking at a user's contributions, diff pages, recent changes, and page histories, a link that looks like: [rollback] – appears next to edits that are at the top of the edit history. Clicking on the link reverts to the last edit not authored by that user, with an automatic edit summary of (Reverted edits by X (Talk); changed back to last version by Y) and marks it as a minor change. If, between loading the User Contributions page and pressing "rollback," someone else edits or rolls back the page, or if there was no previous editor, you will get an error message.