diff --git a/libs/ardour/ardour/midi_playlist.h b/libs/ardour/ardour/midi_playlist.h
index ad0a812cba..f0e1b59d1c 100644
--- a/libs/ardour/ardour/midi_playlist.h
+++ b/libs/ardour/ardour/midi_playlist.h
@@ -72,8 +72,8 @@ public:
 	 * @param cnt Number of frames in read range.
 	 * @param loop_range If non-null, all event times will be mapped into this loop range.
 	 * @param chan_n Must be 0 (this is the audio-style "channel", where each
-	 * channel is backed by a separate region, not MIDI channels, which all
-	 * exist in the same region and are not handled here).
+	 * channel may be backed by a separate source, not MIDI channels, which all
+	 * exist in the same source and are not handled here).
 	 * @return The number of frames read (time, not an event count).
 	 */
 	framecnt_t read (Evoral::EventSink<framepos_t>& buf,