diff --git a/auth/v1/msg.proto b/auth/v1/msg.proto
index cc778e7..552b3b7 100644
--- a/auth/v1/msg.proto
+++ b/auth/v1/msg.proto
@@ -130,6 +130,7 @@ message User {
   string email = 4;
   UserStatus status = 5;
   repeated int64 roles = 6;
+  int64 referrer_user_id = 7;
 }
 
 message UserAddress {