Spotify is testing out personalization for its editor-curated playlists, according to a report today from Hypebot. In one named example, songs that Spotify’s algorithm believed a user would like were mixed into a hand-curated workout playlist. A source independently confirmed the test to The Verge.

The test appears to only be showing for select users and on mid-tier playlists. Whether Spotify plans to roll this out as a permanent feature is still to be determined — the company runs tests all the time for groups of users. But having Spotify’s algorithm shuffle in songs individualized for each user on playlists could be one way to keep the content fresh, as most playlists are updated by curators on a weekly basis.