explanatory comment

diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc
index e53970840b36399fbda788633fc35394a71db125..6d7fea3b266e7f62743d8c155add675f56eda7cf 100644 (file)
--- a/libs/ardour/session_midi.cc
+++ b/libs/ardour/session_midi.cc
@@ -340,6 +340,9 @@ Session::get_midi_nth_route_by_id (PresentationInfo::order_t n) const
 {
        PresentationInfo::Flag f;
 
+       /* These numbers are defined by the MMC specification.
+        */
+
        if (n == 318) {
                f = PresentationInfo::MasterOut;
        } else if (n == 319) {