diff --git a/lib/music_library/artists/artist_info.ex b/lib/music_library/artists/artist_info.ex
index dc4dd401..86b46864 100644
--- a/lib/music_library/artists/artist_info.ex
+++ b/lib/music_library/artists/artist_info.ex
@@ -24,6 +24,7 @@ defmodule MusicLibrary.Artists.ArtistInfo do
 
   @spec changeset(t() | Ecto.Changeset.t(), map()) :: Ecto.Changeset.t()
   def changeset(artist_info, attrs) do
+    # :id is cast because it's set from MusicBrainz, not autogenerated
     artist_info
     |> cast(attrs, [
       :id,