Forum:SH:What's with the "Nice work!" option in article history?

In article history, for example Anakin Skywalker's page history, there's an option next to undo which states "Nice work!". Just curious as to what it does. Thanks! NoahR9 http://vignette2.wikia.nocookie.net/starwars/images/4/46/First_Order.svg/revision/latest/scale-to-width-down/20Chat with me! 07:27, August 26, 2016 (UTC)