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diff --git a/third_party/jpeg-xl/lib/jxl/enc_noise.h b/third_party/jpeg-xl/lib/jxl/enc_noise.h
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+++ b/third_party/jpeg-xl/lib/jxl/enc_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_NOISE_H_
+#define LIB_JXL_ENC_NOISE_H_
+
+// Noise parameter estimation.
+
+#include <stddef.h>
+
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/enc_bit_writer.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/noise.h"
+
+namespace jxl {
+
+struct AuxOut;
+
+// Get parameters of the noise for NoiseParams model
+// Returns whether a valid noise model (with HasAny()) is set.
+Status GetNoiseParameter(const Image3F& opsin, NoiseParams* noise_params,
+                         float quality_coef);
+
+// Does not write anything if `noise_params` are empty. Otherwise, caller must
+// set FrameHeader.flags.kNoise.
+void EncodeNoise(const NoiseParams& noise_params, BitWriter* writer,
+                 size_t layer, AuxOut* aux_out);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_NOISE_H_