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diff --git a/Firestore/core/include/firebase/firestore/set_options.h b/Firestore/core/include/firebase/firestore/set_options.h
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+++ b/Firestore/core/include/firebase/firestore/set_options.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_INCLUDE_FIREBASE_FIRESTORE_SET_OPTIONS_H_
+#define FIRESTORE_CORE_INCLUDE_FIREBASE_FIRESTORE_SET_OPTIONS_H_
+
+namespace firebase {
+namespace firestore {
+
+/**
+ * An options object that configures the behavior of Set() calls. By providing
+ * the SetOptions objects returned by Merge(), the Set() methods in
+ * DocumentReference, WriteBatch and Transaction can be configured to perform
+ * granular merges instead of overwriting the target documents in their
+ * entirety.
+ */
+// TODO(zxu123): add more methods to complete the class and make it useful.
+class SetOptions {
+ public:
+  SetOptions();
+};
+
+}  // namespace firestore
+}  // namespace firebase
+
+#endif  // FIRESTORE_CORE_INCLUDE_FIREBASE_FIRESTORE_SET_OPTIONS_H_