(→Acceptable reversions: follow link)
The main purpose of reversion is to undo vandalism or other [[WP:Disruptive editing|
In the case of a good faith edit, a reversion is appropriate when the reverter believes that the edit makes the article clearly worse and there is no element of the edit that is an improvement. This is often true of small edits. Edits that introduce [[wp:undue|undue weight]] should be reverted until consensus is built.