diff --git a/ArduSub/Parameters.cpp b/ArduSub/Parameters.cpp
index ea38373f97..8e40b9637e 100644
--- a/ArduSub/Parameters.cpp
+++ b/ArduSub/Parameters.cpp
@@ -197,7 +197,7 @@ const AP_Param::Info Sub::var_info[] = {
     // @Param: WP_YAW_BEHAVIOR
     // @DisplayName: Yaw behaviour during missions
     // @Description: Determines how the autopilot controls the yaw during missions and RTL
-    // @Values: 0:Never change yaw, 1:Face next waypoint, 2:Face next waypoint except RTL, 3:Face along GPS course
+    // @Values: 0:Never change yaw, 1:Face next waypoint, 2:Face next waypoint except RTL, 3:Face along GPS course, 4:Correct crosstrack error
     // @User: Standard
     GSCALAR(wp_yaw_behavior,  "WP_YAW_BEHAVIOR",    WP_YAW_BEHAVIOR_DEFAULT),