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diff --git a/Firestore/core/src/firebase/firestore/nanopb/tag.h b/Firestore/core/src/firebase/firestore/nanopb/tag.h
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+++ b/Firestore/core/src/firebase/firestore/nanopb/tag.h
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+/*
+ * Copyright 2018 Google
+ *
+ * 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.
+ */
+
+#ifndef FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_NANOPB_TAG_H__
+#define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_NANOPB_TAG_H__
+
+#include <pb.h>
+
+namespace firebase {
+namespace firestore {
+namespace nanopb {
+
+/**
+ * Represents a nanopb tag.
+ *
+ * field_number is one of the field tags that nanopb generates based off of
+ * the proto messages. They're typically named in the format:
+ * <parentNameSpace>_<childNameSpace>_<message>_<field>_tag, e.g.
+ * google_firestore_v1beta1_Document_name_tag.
+ */
+struct Tag {
+  pb_wire_type_t wire_type;
+  uint32_t field_number;
+};
+
+}  // namespace nanopb
+}  // namespace firestore
+}  // namespace firebase
+
+#endif  // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_NANOPB_TAG_H_