diff --git a/Number_types/doc/Number_types/CGAL/Gmpz.h b/Number_types/doc/Number_types/CGAL/Gmpz.h
index 13e0f92647c..f561662822b 100644
--- a/Number_types/doc/Number_types/CGAL/Gmpz.h
+++ b/Number_types/doc/Number_types/CGAL/Gmpz.h
@@ -10,8 +10,7 @@ based on the <span class="textsc">Gnu</span> Multiple Precision Arithmetic Libra
 \models ::EuclideanRing 
 \models ::RealEmbeddable 
 
-Implementation 
--------------- 
+### Implementation ###
 
 `Gmpz`s are reference counted. 
 
diff --git a/Partition_2/doc/Partition_2/CGAL/polygon_function_objects.h b/Partition_2/doc/Partition_2/CGAL/polygon_function_objects.h
index aed5098a83b..70c05c3112f 100644
--- a/Partition_2/doc/Partition_2/CGAL/polygon_function_objects.h
+++ b/Partition_2/doc/Partition_2/CGAL/polygon_function_objects.h
@@ -11,8 +11,7 @@ a convex polygon or not.
 \sa `CGAL::convex_partition_is_valid_2` 
 \sa `CGAL::Partition_is_valid_traits_2<Traits, PolygonIsValid>` 
 
-Implementation 
--------------- 
+### Implementation ###
 
 This test requires \f$ O(n)\f$ time for a polygon with \f$ n\f$ vertices. 
 
@@ -61,8 +60,7 @@ Function object class that indicates all sequences of points are valid.
 \sa `CGAL::partition_is_valid_2` 
 \sa `CGAL::Partition_is_valid_traits_2<Traits, PolygonIsValid>` 
 
-Implementation 
--------------- 
+### Implementation ###
 
 This test requires \f$ O(1)\f$ time. 
 
@@ -110,8 +108,7 @@ a \f$ y\f$-monotone polygon or not.
 \sa `CGAL::convex_partition_is_valid_2` 
 \sa `CGAL::Partition_is_valid_traits_2<Traits, PolygonIsValid>` 
 
-Implementation 
--------------- 
+### Implementation ###
 
 This test requires \f$ O(n)\f$ time for a polygon with \f$ n\f$ vertices. 
 
diff --git a/Voronoi_diagram_2/doc/Voronoi_diagram_2/Unsupported/NOINCLUDE.h b/Voronoi_diagram_2/doc/Voronoi_diagram_2/Unsupported/NOINCLUDE.h
index e69de29bb2d..0db3279e44b 100644
--- a/Voronoi_diagram_2/doc/Voronoi_diagram_2/Unsupported/NOINCLUDE.h
+++ b/Voronoi_diagram_2/doc/Voronoi_diagram_2/Unsupported/NOINCLUDE.h
@@ -0,0 +1,3 @@
+{
+
+}