diff --git a/libs/midi++2/midi++/mmc.h b/libs/midi++2/midi++/mmc.h
index 55317425ae..2dc38e81c0 100644
--- a/libs/midi++2/midi++/mmc.h
+++ b/libs/midi++2/midi++/mmc.h
@@ -277,7 +277,7 @@ class MachineControl
 
 /** Class to describe a MIDI machine control command to be sent.
  *  In an ideal world we might use a class hierarchy for this, but objects of this type
- *  have to be allocated off the stack for thread safety.
+ *  have to be allocated off the stack for RT safety.
  */
 class MachineControlCommand
 {