diff --git a/event_registration.md b/event_registration.md
index 9062caf..bef5a24 100644
--- a/event_registration.md
+++ b/event_registration.md
@@ -64,7 +64,7 @@ message QRCodePayload {
   TraceLocation locationData = 2;
   CrowdNotifierData crowdNotifierData = 3;
   // byte sequence of CWALocationData
-  bytes countryData = 4;
+  bytes vendorData = 4;
 }
 
 message TraceLocation {