diff --git a/api/api_proto/issue_objects.proto b/api/api_proto/issue_objects.proto
index c6edfda..ec4b23d 100644
--- a/api/api_proto/issue_objects.proto
+++ b/api/api_proto/issue_objects.proto
@@ -1,7 +1,6 @@
-// Copyright 2018 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
+// Copyright 2018 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 // This file defines protobufs for issues and related business
 // objects, e.g., field values, comments, and attachments.
@@ -100,7 +99,7 @@
 }
 
 
-// Next available tag: 28
+// Next available tag: 29
 message Issue {
   string project_name = 1;
   uint32 local_id = 2;
@@ -129,6 +128,7 @@
   uint32 attachment_count = 20;
   repeated Approval approval_values = 21;
   repeated PhaseDef phases = 22;
+  string migrated_id = 28;
 }