diff --git a/Mesh_3/include/CGAL/Mesh_3/Protect_edges_sizing_field.h b/Mesh_3/include/CGAL/Mesh_3/Protect_edges_sizing_field.h
index 7aa12755ba6..894d159d1c1 100644
--- a/Mesh_3/include/CGAL/Mesh_3/Protect_edges_sizing_field.h
+++ b/Mesh_3/include/CGAL/Mesh_3/Protect_edges_sizing_field.h
@@ -460,7 +460,7 @@ void
 Protect_edges_sizing_field<C3T3, MD, Sf>::
 operator()(const bool refine)
 {
-  // This file is only meant to be used with non-periodic triangulations
+  // This class is only meant to be used with non-periodic triangulations
   CGAL_assertion(!(boost::is_same<typename Tr::Periodic_tag, CGAL::Tag_true>::value));
 
 #ifdef CGAL_MESH_3_VERBOSE
diff --git a/Mesh_3/include/CGAL/Mesh_3/Triangulation_helpers.h b/Mesh_3/include/CGAL/Mesh_3/Triangulation_helpers.h
index fc4a16eda29..d25ce6eef75 100644
--- a/Mesh_3/include/CGAL/Mesh_3/Triangulation_helpers.h
+++ b/Mesh_3/include/CGAL/Mesh_3/Triangulation_helpers.h
@@ -156,7 +156,7 @@ public:
                                        const Cell_vector& incident_cells,
                                        typename boost::enable_if_c<Tag::value>::type* = NULL) const;
 
-  // @todo are the two versions really worth it, I can't even tell the difference...
+  // @todo are the two versions really worth it, I can't tell the difference from a time POV...
   template<typename Tag>
   FT get_sq_distance_to_closest_vertex(const Tr& tr,
                                        const Vertex_handle& vh,
diff --git a/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h b/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h
index 4a3a50616d8..34d9b6db2c8 100644
--- a/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h
+++ b/Periodic_3_mesh_3/include/CGAL/Periodic_3_mesh_3/Protect_edges_sizing_field.h
@@ -574,7 +574,7 @@ void
 Protect_edges_sizing_field<C3T3, MD, Sf>::
 operator()(const bool refine)
 {
-  // This file is only meant to be used with periodic triangulations
+  // This class is only meant to be used with periodic triangulations
   CGAL_assertion((boost::is_same<typename Tr::Periodic_tag, CGAL::Tag_true>::value));
 
 #ifdef CGAL_MESH_3_VERBOSE
@@ -613,7 +613,7 @@ operator()(const bool refine)
 #endif
 
     // The assertion below is disabled because c3t3.is_valid() may return false
-    // positive for periodic triangulations, specifically because of the line:
+    // positives for periodic triangulations, specifically because of the line:
     // ' if(! do_intersect(sphere(p, sq_rp), sphere(q, sq_rq))) ... '
     // which does not take periodicity into account
 //    CGAL_assertion(minimal_size_ > 0 || c3t3_.is_valid());
@@ -957,7 +957,7 @@ get_positions_with_unknown_orientation(const Vertex_handle v1,
                                        const Vertex_handle v2,
                                        const Curve_index& curve_index) const
 {
-  // We don't know the orientation ! This is problematic if a vertex corresponds
+  // We don't know the orientation! This is problematic if a vertex corresponds
   // to two points (extremity of a periodic loop).
   CGAL::Orientation orientation = CGAL::ZERO;
   return get_positions(v1, v2, curve_index, orientation);
@@ -3152,8 +3152,8 @@ repopulate_edges_around_corner(const Vertex_handle& v, ErasedVeOutIt out)
   return out;
 }
 
-} // end namespace Periodic_3_mesh_3
+} // namespace Periodic_3_mesh_3
 
-} //namespace CGAL
+} // namespace CGAL
 
 #endif // CGAL_PERIODIC_3_MESH_3_PROTECT_EDGES_SIZING_FIELD_H