added new configuration variable

sample.env

@@ -29,6 +29,10 @@ YOUTUBE_API_KEY=
 # LISTENBRAINZ_DISCOVERY=playlist
 # Time to sleep (in minutes) between scanning and querying tracks from your system (If using Subsonic, Jellyfin)
 # SLEEP=1
-# How multiple artists are separated from eachother in metadata
 # Whether to provide additional info for debugging
-# DEBUG=false
+# DEBUG=false
+
+## Metadata (formatting details, structure, etc.)
+
+# true keeps only the main artist in the artist field; all featured artists go to the title (helps with keeping library clean, might limit ListenBrainz for recognizing the song)
+# SINGLE_ARTIST=false