diff --git a/log.capnp b/log.capnp
index 7453846..c8a54d0 100644
--- a/log.capnp
+++ b/log.capnp
@@ -1804,6 +1804,7 @@ struct EncodeData {
   idx @0 :EncodeIndex;
   data @1 :Data;
   header @2 :Data;
+  unixTimestampNanos @3 :UInt64;
 }
 
 struct Event {