diff --git a/gensrc/proto/cloud.proto b/gensrc/proto/cloud.proto
index b60f330dcfeb4b..3e64b7a4b38b80 100644
--- a/gensrc/proto/cloud.proto
+++ b/gensrc/proto/cloud.proto
@@ -1799,7 +1799,10 @@ enum MetaServiceCode {
     STREAMING_JOB_PROGRESS_NOT_FOUND = 5006;
 
     // Rate limit
+    // Request is rejected by the RPC-specific QPS limiter.
     MAX_QPS_LIMIT = 6001;
+    // Request is rejected by the MetaService-wide rate limiter instead of a single RPC limiter.
+    MS_TOO_BUSY = 6002;
 
     ERR_ENCRYPT = 7001;
     ERR_DECPYPT = 7002;