diff --git a/Periodic_2_triangulation_2/doc/Periodic_2_triangulation_2/Periodic_2_triangulation_2.txt b/Periodic_2_triangulation_2/doc/Periodic_2_triangulation_2/Periodic_2_triangulation_2.txt
index 843944cba95..19a0f572fba 100644
--- a/Periodic_2_triangulation_2/doc/Periodic_2_triangulation_2/Periodic_2_triangulation_2.txt
+++ b/Periodic_2_triangulation_2/doc/Periodic_2_triangulation_2/Periodic_2_triangulation_2.txt
@@ -398,15 +398,15 @@ in the unit rectangle. The tests were done on an Intel i7 @ 2.67GHz.
 
 A 2D periodic triangulation can be visualized by calling the \link PkgDrawPeriodic2Triangulation2 CGAL::draw<P2T2>() \endlink function as shown in the following example. This function opens a new window showing the given Periodic Triangulation. Elements of the periodic triangulation can be viewed in four different modes:
 
-- <B>STORED</B> Display all geometric primitives as they are stored in Triangulation_data_structure_2
-- <B>UNIQUE</B> Display only one representative of each geometric primitive even if the triangulation is computed in multiply sheeted covering space.
-- <B>STORED_COVER_DOMAIN</B> Same as STORED but also display  all primitives whose intersection with the original domain of the current covering space is non-empty
-- <B>UNIQUE_COVER_DOMAIN</B> Same as UNIQUE but also display all primitives whose intersection with the original domain of the current covering space is non-empty    
+- <B>STORED</B> Display all geometric primitives as they are stored in Triangulation_data_structure_2;
+- <B>UNIQUE</B> Display only one representative of each geometric primitive even if the triangulation is computed in multiply sheeted covering space;
+- <B>STORED_COVER_DOMAIN</B> Same as STORED but also display  all primitives whose intersection with the original domain of the current covering space is non-empty;
+- <B>UNIQUE_COVER_DOMAIN</B> Same as UNIQUE but also display all primitives whose intersection with the original domain of the current covering space is non-empty.  
 
-The domain can also be visualized by a key press. To see how to visualize the Periodic Triangulation in various modes, press key H when the viewer window is active and go to Keyboard tab. See \cgalFigureRef{P2Triangulation2figdraw1} and \cgalFigureRef{P2Triangulation2figdraw2}
+The domain can also be visualized by a key press. To see how to visualize the Periodic Triangulation in various modes, press key H when the viewer window is active and go to Keyboard tab. See \cgalFigureRef{P2Triangulation2figdraw1} and \cgalFigureRef{P2Triangulation2figdraw2}.
 
 \cgalFigureBegin{P2Triangulation2figdraw1, unique.png, unique-cover.png}
-Result of the run of the draw_periodic_2_triangulation_2 program for display modes Unique(left) and Unique Cover Domain(right). The window allows to navigate through the 3D scene.
+Result of the run of the draw_periodic_2_triangulation_2 program for display modes Unique(left) and Unique Cover Domain(right). The window allows to navigate through the 2D scene.
 \cgalFigureEnd
 \cgalFigureBegin{P2Triangulation2figdraw2, stored.png, stored-cover.png}
 Result of the run of the draw_periodic_2_triangulation_2 program for display modes Stored(left) and Stored Cover Domain(right).
diff --git a/Voronoi_diagram_2/doc/Voronoi_diagram_2/CGAL/draw_voronoi_diagram_2.h b/Voronoi_diagram_2/doc/Voronoi_diagram_2/CGAL/draw_voronoi_diagram_2.h
index bc3bb64e1c6..ef273cb1734 100644
--- a/Voronoi_diagram_2/doc/Voronoi_diagram_2/CGAL/draw_voronoi_diagram_2.h
+++ b/Voronoi_diagram_2/doc/Voronoi_diagram_2/CGAL/draw_voronoi_diagram_2.h
@@ -3,7 +3,7 @@ namespace CGAL {
 /*!
 \ingroup PkgDrawVoronoiDiagram2
 
-Opens a new window and draws `av2`, the `Voronoi_diagram_2` constructed from a Delaunay Graph which is a model of `DelaunayGraph_2` concept.
+opens a new window and draws `av2`, the `Voronoi_diagram_2` constructed from a Delaunay Graph which is a model of `DelaunayGraph_2` concept.
 The class `Voronoi_diagram_2` provides an adaptor to view a triangulated Delaunay graph as their dual subdivision, the 
 Voronoi diagram. A call to this function is blocking, that is the program continues as soon as the user closes the window. 
  This function requires CGAL_Qt5, and is only available if the flag CGAL_USE_BASIC_VIEWER is defined at compile time.
@@ -14,4 +14,4 @@ Voronoi diagram. A call to this function is blocking, that is the program contin
 template<class V2>
 void draw(const V2& av2);
 
-} /* namespace CGAL */
\ No newline at end of file
+} /* namespace CGAL */
diff --git a/Voronoi_diagram_2/doc/Voronoi_diagram_2/Voronoi_diagram_2.txt b/Voronoi_diagram_2/doc/Voronoi_diagram_2/Voronoi_diagram_2.txt
index e9fe5e9164e..41b3f9828cf 100644
--- a/Voronoi_diagram_2/doc/Voronoi_diagram_2/Voronoi_diagram_2.txt
+++ b/Voronoi_diagram_2/doc/Voronoi_diagram_2/Voronoi_diagram_2.txt
@@ -499,7 +499,7 @@ This function requires CGAL_Qt5, and is only available if the flag CGAL_USE_BASI
 
 \cgalFigureBegin{draw_voronoi_diagram, draw_voronoi_diagram.png}
 Result of the draw_voronoi_diagram_2 program. A window shows the Voronoi vertices and edges. 
-The window allows navigation through the 3D scene.
+The window allows navigation through the 2D scene.
 \cgalFigureEnd
 
 */