diff --git a/opendbc/car/car.capnp b/opendbc/car/car.capnp
index b4cd3f93..23543cc1 100644
--- a/opendbc/car/car.capnp
+++ b/opendbc/car/car.capnp
@@ -376,6 +376,7 @@ struct CarControl {
   orientationNED @13 :List(Float32);
   angularVelocity @14 :List(Float32);
   currentCurvature @17 :Float32;  # From vehicle model
+  curvatureControllerActive @18: Bool;
 
   cruiseControl @4 :CruiseControl;
   hudControl @5 :HUDControl;