diff --git a/ArduPlane/Parameters.cpp b/ArduPlane/Parameters.cpp
index be3edac495..268c81a8fd 100644
--- a/ArduPlane/Parameters.cpp
+++ b/ArduPlane/Parameters.cpp
@@ -410,7 +410,7 @@ const AP_Param::Info Plane::var_info[] = {
 
     // @Param: THR_MAX
     // @DisplayName: Maximum Throttle
-    // @Description: Maximum throttle percentage used in automatic throttle modes.
+    // @Description: Maximum throttle percentage used in all modes except manual, provided THR_PASS_STAB is not set.
     // @Units: %
     // @Range: 0 100
     // @Increment: 1