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diff --git a/llvm/lib/Target/ARM/ARMMacroFusion.h b/llvm/lib/Target/ARM/ARMMacroFusion.h
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index 000000000000..4896a4a2544d
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+++ b/llvm/lib/Target/ARM/ARMMacroFusion.h
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+//===- ARMMacroFusion.h - ARM Macro Fusion ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file This file contains the ARM definition of the DAG scheduling mutation
+/// to pair instructions back to back.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_ARMMACROFUSION_H
+#define LLVM_LIB_TARGET_ARM_ARMMACROFUSION_H
+
+#include "llvm/CodeGen/MachineScheduler.h"
+
+namespace llvm {
+
+/// Note that you have to add:
+///   DAG.addMutation(createARMMacroFusionDAGMutation());
+/// to ARMPassConfig::createMachineScheduler() to have an effect.
+std::unique_ptr<ScheduleDAGMutation> createARMMacroFusionDAGMutation();
+
+} // llvm
+
+#endif