diff --git a/api/api_proto/features_objects.proto b/api/api_proto/features_objects.proto
new file mode 100644
index 0000000..14b61ac
--- /dev/null
+++ b/api/api_proto/features_objects.proto
@@ -0,0 +1,43 @@
+// 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
+
+syntax = "proto3";
+
+package monorail;
+
+import "api/api_proto/common.proto";
+import "api/api_proto/issue_objects.proto";
+
+
+// Next available tag: 9
+message Hotlist {
+  UserRef owner_ref = 1;
+  repeated UserRef editor_refs = 5;
+  repeated UserRef follower_refs = 6;
+  string name = 2;
+  string summary = 3;
+  string description = 4;
+  string default_col_spec = 7;
+  bool is_private = 8;
+}
+
+
+// Next available tag: 6
+message HotlistItem {
+  Issue issue = 1;
+  uint32 rank = 2;
+  UserRef adder_ref = 3;
+  uint32 added_timestamp = 4;
+  string note = 5;
+}
+
+
+// Next available tag: 5
+message HotlistPeopleDelta {
+  UserRef new_owner_ref = 1;
+  repeated UserRef add_editor_refs = 2;
+  repeated UserRef add_follower_refs = 3;
+  repeated UserRef remove_user_refs = 4;
+}
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