diff --git a/gtk2_ardour/pianoroll_midi_view.cc b/gtk2_ardour/pianoroll_midi_view.cc
index 8124aa2ea9..6d388babb9 100644
--- a/gtk2_ardour/pianoroll_midi_view.cc
+++ b/gtk2_ardour/pianoroll_midi_view.cc
@@ -90,6 +90,8 @@ PianorollMidiView::~PianorollMidiView ()
 bool
 PianorollMidiView::midi_canvas_group_event (GdkEvent* ev)
 {
+	/* Let MidiView do its thing */
+
 	MidiView::midi_canvas_group_event (ev);
 
 	return _editing_context.canvas_bg_event (ev, event_rect);