diff --git a/car/README.md b/car/README.md
index e890129..6a09d48 100644
--- a/car/README.md
+++ b/car/README.md
@@ -5,3 +5,4 @@
     python3 -m pip install pymavlink gpsd-py3
 
 
+MAVLINK20=1 python3 car.py