diff --git a/src/ss/member/identity.rs b/src/ss/member/identity.rs
index ddc52e6..08aa4cb 100644
--- a/src/ss/member/identity.rs
+++ b/src/ss/member/identity.rs
@@ -3,6 +3,7 @@ use crate::protobuf::rpc;
 
 const SUBJECT: &str = "bet.beteran.ss.member.identity";
 
+pub const SUBJECT_CAPTCHA: &str = const_format::concatcp!(SUBJECT, ".Captcha");
 /// subject = bet.beteran.ss.member.identity.Captcha
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct CaptchaRequest {