Everybody can undo edits on a wiki, but this takes a couple of clicks. Rollbackers are able to revert bad edits with one click. They can use the rollback link on diff pages, user contributions lists and the list of the recent changes.

Administrators have the right automatically. A user with the rollback right are not always administrators.

Rollbackers don't have a tag on their profile, but you can add it manually.

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