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diff --git a/intern/opensubdiv/internal/opensubdiv_converter_orient.h b/intern/opensubdiv/internal/opensubdiv_converter_orient.h
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+// Copyright 2018 Blender Foundation. All rights reserved.
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software Foundation,
+// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+// Author: Sergey Sharybin
+
+#ifndef OPENSUBDIV_CONVERTER_ORIENT_H_
+#define OPENSUBDIV_CONVERTER_ORIENT_H_
+
+#include <opensubdiv/far/types.h>
+
+// Set of utility functions which are needed to bring topology to an orientation
+// (or, winding, if you wish) which OpenSubdiv expects.
+
+namespace opensubdiv_capi {
+
+inline void reverseFaceVertices(int* face_vertices, const int num_vertices);
+
+// TODO(sergey): Document which value corresponds to which winding.
+inline int getLoopWinding(int vert0_of_face, int vert1_of_face);
+
+inline void reverseFaceLoops(
+    OpenSubdiv::Far::IndexArray* face_vertices,
+    OpenSubdiv::Far::IndexArray* face_edges);
+
+// Used for debugging, checks whether orientation happened correct.
+void checkOrientedVertexConnectivity(const int num_vertex_edges,
+                                     const int num_vertex_faces,
+                                     const int* vertex_edges,
+                                     const int* vertex_faces,
+                                     const int* dst_vertex_edges,
+                                     const int* dst_vertex_faces);
+
+}  // namespace opensubdiv_capi
+
+#endif  // OPENSUBDIV_CONVERTER_ORIENT_H_
+
+#include "internal/opensubdiv_converter_orient_impl.h"