diff --git a/ArduSub/mode.cpp b/ArduSub/mode.cpp
index d445dd5c8c..cb3b10c53c 100644
--- a/ArduSub/mode.cpp
+++ b/ArduSub/mode.cpp
@@ -112,7 +112,7 @@ bool Sub::set_mode(Mode::Number mode, ModeReason reason)
     // perform any cleanup required by previous flight mode
     exit_mode(flightmode, new_flightmode);
 
-    // store previous flight mode (only used by tradeheli's autorotation)
+    // store previous flight mode
     prev_control_mode = control_mode;
 
     // update flight mode