--- /dev/null
+// Copyright 2019 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+syntax = "proto3";
+
+package google.ads.googleads.v1.enums;
+
+import "google/api/annotations.proto";
+
+option csharp_namespace = "Google.Ads.GoogleAds.V1.Enums";
+option go_package = "google.golang.org/genproto/googleapis/ads/googleads/v1/enums;enums";
+option java_multiple_files = true;
+option java_outer_classname = "BidModifierSourceProto";
+option java_package = "com.google.ads.googleads.v1.enums";
+option objc_class_prefix = "GAA";
+option php_namespace = "Google\\Ads\\GoogleAds\\V1\\Enums";
+option ruby_package = "Google::Ads::GoogleAds::V1::Enums";
+// Proto file describing bid modifier source.
+
+// Container for enum describing possible bid modifier sources.
+message BidModifierSourceEnum {
+ // Enum describing possible bid modifier sources.
+ enum BidModifierSource {
+ // Not specified.
+ UNSPECIFIED = 0;
+
+ // Used for return value only. Represents value unknown in this version.
+ UNKNOWN = 1;
+
+ // The bid modifier is specified at the campaign level, on the campaign
+ // level criterion.
+ CAMPAIGN = 2;
+
+ // The bid modifier is specified (overridden) at the ad group level.
+ AD_GROUP = 3;
+ }
+
+
+}