diff --git a/sw/airborne/nav_survey_rectangle.h b/sw/airborne/nav_survey_rectangle.h
index dfbf202658..ce14d2ea0b 100644
--- a/sw/airborne/nav_survey_rectangle.h
+++ b/sw/airborne/nav_survey_rectangle.h
@@ -1,4 +1,4 @@
-/** Automatic survey of a sector (south-north or west-east sweep) */
+/** Automatic survey of a rectangle (defined by two points) (south-north or west-east sweep) */
 
 #ifndef NAV_SURVEY_RECTANGLE_H
 #define NAV_SURVEY_RECTANGLE_H