diff --git a/include/xquic/xquic.h b/include/xquic/xquic.h
index 5c946dcd..0158fdbd 100644
--- a/include/xquic/xquic.h
+++ b/include/xquic/xquic.h
@@ -2142,6 +2142,9 @@ xqc_int_t xqc_path_get_local_addr(xqc_connection_t *conn, uint64_t path_id,
     struct sockaddr *addr, socklen_t addr_cap, socklen_t *local_addr_len);
 
 
+/*
+ * These 2 APIs below is only used for IETF interop tests. Please don't use them for formal logic!
+ * */
 XQC_EXPORT_PUBLIC_API
 xqc_int_t xqc_conn_trigger_cid_rotation_on_path(xqc_engine_t *engine, const xqc_cid_t *scid, uint64_t path_id);