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diff --git a/third_party/jpeg-xl/lib/jxl/render_pipeline/stage_epf.h b/third_party/jpeg-xl/lib/jxl/render_pipeline/stage_epf.h
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+++ b/third_party/jpeg-xl/lib/jxl/render_pipeline/stage_epf.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_RENDER_PIPELINE_STAGE_EPF_H_
+#define LIB_JXL_RENDER_PIPELINE_STAGE_EPF_H_
+#include <math.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include <algorithm>
+#include <utility>
+#include <vector>
+
+#include "lib/jxl/image.h"
+#include "lib/jxl/loop_filter.h"
+#include "lib/jxl/render_pipeline/render_pipeline_stage.h"
+
+namespace jxl {
+
+// Applies the `epf_stage`-th EPF step with the given settings and `sigma`.
+// `sigma` will be accessed with an offset of (kSigmaPadding, kSigmaPadding),
+// and should have (kSigmaBorder, kSigmaBorder) mirrored sigma values available
+// around the main image. See also filters.(h|cc)
+std::unique_ptr<RenderPipelineStage> GetEPFStage(const LoopFilter& lf,
+                                                 const ImageF& sigma,
+                                                 size_t epf_stage);
+}  // namespace jxl
+
+#endif  // LIB_JXL_RENDER_PIPELINE_STAGE_EPF_H_