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diff --git a/third_party/jpeg-xl/lib/jxl/enc_photon_noise.h b/third_party/jpeg-xl/lib/jxl/enc_photon_noise.h
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+++ b/third_party/jpeg-xl/lib/jxl/enc_photon_noise.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_ENC_PHOTON_NOISE_H_
+#define LIB_JXL_ENC_PHOTON_NOISE_H_
+
+#include "lib/jxl/dec_xyb.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/noise.h"
+
+namespace jxl {
+
+// Constructs a NoiseParams representing the noise that would be seen at the
+// selected nominal exposure on a last-decade (as of 2021) color camera with a
+// 36×24mm sensor (“35mm format”).
+NoiseParams SimulatePhotonNoise(size_t xsize, size_t ysize, float iso);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_PHOTON_NOISE_H_