diff --git a/auth/v1/msg.proto b/auth/v1/msg.proto
index 43c5b27..c14b773 100644
--- a/auth/v1/msg.proto
+++ b/auth/v1/msg.proto
@@ -55,6 +55,7 @@ message UserSendOtpRes {
 message UserLoginReq {
   string mobile = 1;
   string otp_code = 2;
+  string referral_code = 3;
 }
 message UserRefreshTokenReq {
   string refresh_token = 1;