diff --git a/server-rs/crates/api-server/src/runtime_profile.rs b/server-rs/crates/api-server/src/runtime_profile.rs
index acd944add..0677ef55b 100644
--- a/server-rs/crates/api-server/src/runtime_profile.rs
+++ b/server-rs/crates/api-server/src/runtime_profile.rs
@@ -1500,6 +1500,9 @@ fn is_runtime_profile_domain_error(error: &SpacetimeClientError) -> bool {
     }
 }
 
+// TODO(refactor): 兑换码链路尚未接入 typed error code，仍靠中文文案匹配判 400；
+// 后续按会员链路（RuntimeProfileMembershipErrorCode + SpacetimeClientError::ProcedureRejected）
+// 的做法，让 module 侧兑换码拒绝也携带机器可读错误码。
 fn is_runtime_profile_redeem_code_domain_error(message: &str) -> bool {
     matches!(
         message,