diff --git a/proto/device_sync/message_backup.proto b/proto/device_sync/message_backup.proto
index d8d834c..f465651 100644
--- a/proto/device_sync/message_backup.proto
+++ b/proto/device_sync/message_backup.proto
@@ -16,6 +16,8 @@ message GroupMessageSave {
   int32 version_minor = 11;
   string authority_id = 12;
   optional bytes reference_id = 13;
+  optional int64 message_disappear_from_ns = 14;
+  optional int64 message_disappear_in_ns = 15;
 }
 
 // Group message kind