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diff --git a/tzs2storage/tools/src/proto/geotz_protos.proto b/tzs2storage/tools/src/proto/geotz_protos.proto
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+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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 = "proto2";
+
+option java_package = "com.android.timezone.location.tools.proto";
+option java_multiple_files = false;
+
+package com.android.timezone.location.tools.proto;
+
+// The format need to write a TZ S2 data file.
+message TimeZones {
+    // All the time zone ID sets referenced by index from the ranges.
+    repeated TimeZoneIdSet timeZoneIdSets = 1;
+
+    // S2 cell ranges with the same time zone IDs. Must be ordered by (unsigned)
+    // S2 start cell ID, no overlaps, gaps permitted.
+    repeated S2Range ranges = 2;
+}
+
+// Sets of time zone IDs.
+message TimeZoneIdSet {
+
+    // A set of IANA TZDB time zone IDs, e.g. {"Europe/London", "Europe/Paris"}
+    repeated string timeZoneIds = 1;
+}
+
+// An S2 cell range with the same time zone ID(s).
+message S2Range {
+
+    // The start S2 cell ID (inclusive).
+    required uint64 startCellId = 1;
+
+    // The end S2 cell ID (exclusive).
+    required uint64 endCellId = 2;
+
+    // The index of the TimeZoneIdSet (TimeZones.timeZoneIdSets) associated with
+    // the range.
+    required uint32 timeZoneIdSetIndex = 3;
+}