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diff --git a/third_party/highway/hwy/examples/skeleton.h b/third_party/highway/hwy/examples/skeleton.h
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+// Copyright 2020 Google LLC
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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.
+
+// Demo interface to target-specific code in skeleton.cc
+
+// Normal header with include guard and namespace.
+#ifndef HIGHWAY_HWY_EXAMPLES_SKELETON_H_
+#define HIGHWAY_HWY_EXAMPLES_SKELETON_H_
+
+#include <stddef.h>
+
+// Platform-specific definitions used for declaring an interface, independent of
+// the SIMD instruction set.
+#include "hwy/base.h"  // HWY_RESTRICT
+
+namespace skeleton {
+
+// Computes base-2 logarithm by converting to float. Supports dynamic dispatch.
+HWY_DLLEXPORT void CallFloorLog2(const uint8_t* HWY_RESTRICT in,
+                                 const size_t count, uint8_t* HWY_RESTRICT out);
+
+}  // namespace skeleton
+
+#endif  // HIGHWAY_HWY_EXAMPLES_SKELETON_H_