Information for the Artist description is now copied from the Bio on an Artists Spotify profile. This can be seen in Spotify by clicking the about tab and can be updated at SpotifyArtists.com.
Additional information, such as booking contact and manager is taken from the FaceBook fan page. To make sure the information is correct you can add the FaceBook url to your Chartmetric profile by clicking 'edit' at the top of the Artist page on Chartmetric.
The description should update within 24-48 hours.