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diff --git a/tools/proto_merger/proto_file_serializer.h b/tools/proto_merger/proto_file_serializer.h
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+++ b/tools/proto_merger/proto_file_serializer.h
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+/*
+ * Copyright (C) 2021 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.
+ */
+
+#ifndef TOOLS_PROTO_MERGER_PROTO_FILE_SERIALIZER_H_
+#define TOOLS_PROTO_MERGER_PROTO_FILE_SERIALIZER_H_
+
+#include "tools/proto_merger/proto_file.h"
+
+namespace perfetto {
+namespace proto_merger {
+
+// Serializes a ProtoFile struct into a .proto file which is
+// capable of being parsed by protoc.
+// For example:
+// ProtoFile {
+//   messages: [
+//     Message {
+//       name: Baz
+//       fields: [
+//         Field {
+//           label: optional
+//           type: Foo
+//           name: foo
+//           number: 1
+//         }
+//         Field {
+//           label: optional
+//           type: Bar
+//           name: bar
+//           number: 2
+//         }
+//       ]
+//     }
+//   ]
+// }
+//
+// will convert to:
+//
+// message Baz {
+//   optional Foo foo = 1;
+//   optonal Bar bar = 2;
+// }
+std::string ProtoFileToDotProto(const ProtoFile&);
+
+}  // namespace proto_merger
+}  // namespace perfetto
+
+#endif  // TOOLS_PROTO_MERGER_PROTO_FILE_SERIALIZER_H_