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diff --git a/third_party/jpeg-xl/lib/jxl/luminance.h b/third_party/jpeg-xl/lib/jxl/luminance.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_LUMINANCE_H_
+#define LIB_JXL_LUMINANCE_H_
+
+namespace jxl {
+
+// Chooses a default intensity target based on the transfer function of the
+// image, if known. For SDR images or images not known to be HDR, returns
+// kDefaultIntensityTarget, for images known to have PQ or HLG transfer function
+// returns a higher value.
+
+struct ImageMetadata;
+// TODO(eustas): rename
+void SetIntensityTarget(ImageMetadata* m);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_LUMINANCE_H_