Methods, systems, and apparatus, including computer programs encoded on computer storage media, for automatically updating metadata. In one aspect, a method includes determining that metadata associated with an item of electronic content has been updated on a first device, and automatically communicating a notification of the update between the first device and one or more servers. The method also includes selecting a second device that is associated with a user of the first device, automatically communicating the notification between the one or more servers and the selected second device, and automatically updating, by the second device, metadata that is stored on the second device and that is associated with the item of electronic content, based on the notification.