diff --git a/doc/architecture/trace_file_naming.adoc b/doc/architecture/trace_file_naming.adoc
index bbc892422..2c4bf46da 100644
--- a/doc/architecture/trace_file_naming.adoc
+++ b/doc/architecture/trace_file_naming.adoc
@@ -29,6 +29,8 @@ Trace file contains `TrafficUpdate` messages.
 `tc`::
 Trace file contains `TrafficCommand` messages.
 
+`hvd`::
+Trace file contains `HostVehicleData` messages.
 
 **Example**