diff --git a/psa_car_controller/psacc/repository/config_repository.py b/psa_car_controller/psacc/repository/config_repository.py
index 6f0b83e5..b59976c6 100644
--- a/psa_car_controller/psacc/repository/config_repository.py
+++ b/psa_car_controller/psacc/repository/config_repository.py
@@ -16,7 +16,8 @@
 currency = €
 # minimum trip length in km so it's added to stats and map in website
 minimum trip length =
-
+# for future use
+length unit = km
 [Electricity config]
 # price by kw/h
 day price =