diff --git a/libraries/AC_AttitudeControl/AC_PosControl.cpp b/libraries/AC_AttitudeControl/AC_PosControl.cpp
index aea0cb1c93..39bd43e2b5 100644
--- a/libraries/AC_AttitudeControl/AC_PosControl.cpp
+++ b/libraries/AC_AttitudeControl/AC_PosControl.cpp
@@ -166,7 +166,7 @@ void AC_PosControl::set_target_to_stopping_point_z()
     get_stopping_point_z(_pos_target);
 }
 
-/// get_stopping_point_z - sets stopping_point.z to a reasonable stopping altitude in cm above home
+/// get_stopping_point_z - calculates stopping point based on current position, velocity, vehicle acceleration
 void AC_PosControl::get_stopping_point_z(Vector3f& stopping_point) const
 {
     const float curr_pos_z = _inav.get_altitude();
diff --git a/libraries/AC_AttitudeControl/AC_PosControl.h b/libraries/AC_AttitudeControl/AC_PosControl.h
index 213f3de3aa..fad6a88888 100644
--- a/libraries/AC_AttitudeControl/AC_PosControl.h
+++ b/libraries/AC_AttitudeControl/AC_PosControl.h
@@ -128,7 +128,7 @@ public:
     /// set_target_to_stopping_point_z - sets altitude target to reasonable stopping altitude in cm above home
     void set_target_to_stopping_point_z();
 
-    /// get_stopping_point_z - sets stopping_point.z to a reasonable stopping altitude in cm above home
+    /// get_stopping_point_z - calculates stopping point based on current position, velocity, vehicle acceleration
     void get_stopping_point_z(Vector3f& stopping_point) const;
 
     /// init_takeoff - initialises target altitude if we are taking off