diff --git a/marti_nav_msgs/srv/PlanRoute.srv b/marti_nav_msgs/srv/PlanRoute.srv
index 028ad77..b2ace30 100644
--- a/marti_nav_msgs/srv/PlanRoute.srv
+++ b/marti_nav_msgs/srv/PlanRoute.srv
@@ -10,3 +10,4 @@ Route  route     # planned route
 
 bool success     # indicate successful run of service
 string message   # informational, e.g. for error messages
+float64 cost     # informational, cost of planned route
\ No newline at end of file