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diff --git a/third_party/jpeg-xl/lib/jxl/opsin_params.h b/third_party/jpeg-xl/lib/jxl/opsin_params.h
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+++ b/third_party/jpeg-xl/lib/jxl/opsin_params.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_OPSIN_PARAMS_H_
+#define LIB_JXL_OPSIN_PARAMS_H_
+
+// Constants that define the XYB color space.
+
+#include "lib/jxl/base/compiler_specific.h"
+
+namespace jxl {
+
+// Returns 3x3 row-major matrix inverse of kOpsinAbsorbanceMatrix.
+// opsin_image_test verifies this is actually the inverse.
+const float* GetOpsinAbsorbanceInverseMatrix();
+
+void InitSIMDInverseMatrix(const float* JXL_RESTRICT inverse,
+                           float* JXL_RESTRICT simd_inverse,
+                           float intensity_target);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_OPSIN_PARAMS_H_