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diff --git a/payload_consumer/partition_update_generator_interface.h b/payload_consumer/partition_update_generator_interface.h
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+++ b/payload_consumer/partition_update_generator_interface.h
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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.
+//
+
+#ifndef UPDATE_ENGINE_PAYLOAD_CONSUMER_PARTITION_UPDATE_GENERATOR_INTERFACE_H_
+#define UPDATE_ENGINE_PAYLOAD_CONSUMER_PARTITION_UPDATE_GENERATOR_INTERFACE_H_
+
+#include <memory>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "update_engine/common/boot_control_interface.h"
+
+namespace chromeos_update_engine {
+class PartitionUpdate;
+
+// This class parses the partitions that are not included in the payload of a
+// partial A/B update. And it generates additional operations for these
+// partitions to make the update complete.
+class PartitionUpdateGeneratorInterface {
+ public:
+  virtual ~PartitionUpdateGeneratorInterface() = default;
+
+  // Adds PartitionUpdate for partitions not included in the payload. For static
+  // partitions, it generates SOURCE_COPY operations to copy the bytes from the
+  // source slot to target slot. For dynamic partitions, it only calculates the
+  // partition hash for the filesystem verification later.
+  virtual bool GenerateOperationsForPartitionsNotInPayload(
+      BootControlInterface::Slot source_slot,
+      BootControlInterface::Slot target_slot,
+      const std::set<std::string>& partitions_in_payload,
+      std::vector<PartitionUpdate>* update_list) = 0;
+};
+
+namespace partition_update_generator {
+std::unique_ptr<PartitionUpdateGeneratorInterface> Create(
+    BootControlInterface* boot_control, size_t block_size);
+}
+
+}  // namespace chromeos_update_engine
+
+#endif