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diff --git a/third_party/jpeg-xl/lib/jxl/enc_gaborish.h b/third_party/jpeg-xl/lib/jxl/enc_gaborish.h
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+++ b/third_party/jpeg-xl/lib/jxl/enc_gaborish.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_GABORISH_H_
+#define LIB_JXL_GABORISH_H_
+
+// Linear smoothing (3x3 convolution) for deblocking without too much blur.
+
+#include <stdint.h>
+
+#include "lib/jxl/base/compiler_specific.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/image.h"
+
+namespace jxl {
+
+// Used in encoder to reduce the impact of the decoder's smoothing.
+// This is not exact. Works in-place to reduce memory use.
+// The input is typically in XYB space.
+void GaborishInverse(Image3F* in_out, float mul[3], ThreadPool* pool);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_GABORISH_H_