diff --git a/Shape_detection/include/CGAL/Shape_detection/Region_growing/free_functions.h b/Shape_detection/include/CGAL/Shape_detection/Region_growing/free_functions.h
index 886a07d2af6..c4af27ec521 100644
--- a/Shape_detection/include/CGAL/Shape_detection/Region_growing/free_functions.h
+++ b/Shape_detection/include/CGAL/Shape_detection/Region_growing/free_functions.h
@@ -206,7 +206,7 @@ OutputIterator region_growing_planes(
 
   @tparam PolygonMesh
     a model of `FaceListGraph`
-  @tparam OutputIterator a model of `OutputIterator` accepting a `std::pair<Kernel::Plane_3, std::vector<boost::graph_traits<PolygonMesh>::face_iterator> >`.
+  @tparam OutputIterator a model of `OutputIterator` accepting a `std::pair<Kernel::Plane_3, std::vector<boost::graph_traits<PolygonMesh>::%face_iterator> >`.
   @tparam NamedParameters a sequence of \ref bgl_namedparameters "Named Parameters"
 
   @param polygon_mesh polygon mesh for region growing.