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diff --git a/third_party/jpeg-xl/lib/extras/dec/pnm.h b/third_party/jpeg-xl/lib/extras/dec/pnm.h
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+++ b/third_party/jpeg-xl/lib/extras/dec/pnm.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_EXTRAS_DEC_PNM_H_
+#define LIB_EXTRAS_DEC_PNM_H_
+
+// Decodes PBM/PGM/PPM/PFM pixels in memory.
+
+#include <stddef.h>
+#include <stdint.h>
+
+// TODO(janwas): workaround for incorrect Win64 codegen (cause unknown)
+#include <hwy/highway.h>
+
+#include "lib/extras/dec/color_hints.h"
+#include "lib/extras/packed_image.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/padded_bytes.h"
+#include "lib/jxl/base/span.h"
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+
+struct SizeConstraints;
+
+namespace extras {
+
+// Decodes `bytes` into `ppf`. color_hints may specify "color_space", which
+// defaults to sRGB.
+Status DecodeImagePNM(Span<const uint8_t> bytes, const ColorHints& color_hints,
+                      PackedPixelFile* ppf,
+                      const SizeConstraints* constraints = nullptr);
+
+void TestCodecPNM();
+
+}  // namespace extras
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_DEC_PNM_H_