diff --git a/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_spherical_construction_helper.h b/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_spherical_construction_helper.h
index 0262279cf92..42c9482986a 100644
--- a/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_spherical_construction_helper.h
+++ b/Arrangement_on_surface_2/include/CGAL/Arr_topology_traits/Arr_spherical_construction_helper.h
@@ -61,10 +61,10 @@ public:
   typedef Unique_hash_map<Halfedge_handle, Indices_list>
     Halfedge_indices_map;
 
-  // The following should be private. It is declared protected toas a
+  // The following should be private. It is declared 'protected' as a
   // workaround to a problem with VC. (At least VC 14 exhibits this problem).
   // When declared private, VC claims that Gt2 is private (within
-  // Arr_spherical_construction_helper; thus, it cannot be access by
+  // Arr_spherical_construction_helper); thus, it cannot be access by
   // Arr_spherical_construction_helper.
 protected:
   typedef typename Arrangement_2::Topology_traits       Topology_traits;