diff --git a/log.capnp b/log.capnp
index 52b40ee..5f881bf 100644
--- a/log.capnp
+++ b/log.capnp
@@ -453,6 +453,7 @@ struct LiveCalibrationData {
   extrinsicMatrix @4 :List(Float32);
   # the direction of travel vector in device frame
   rpyCalib @7 :List(Float32);
+  rpyCalibSpread @8 :List(Float32);
 }
 
 struct LiveTracks {