diff --git a/Visibility_2/doc/Visibility_2/CGAL/Rotational_sweep_visibility_2.h b/Visibility_2/doc/Visibility_2/CGAL/Rotational_sweep_visibility_2.h
index d5ea4df164a..f11a3ab543a 100644
--- a/Visibility_2/doc/Visibility_2/CGAL/Rotational_sweep_visibility_2.h
+++ b/Visibility_2/doc/Visibility_2/CGAL/Rotational_sweep_visibility_2.h
@@ -13,7 +13,7 @@ It must be an instance of `CGAL::Arrangement_2`, where its `CGAL::Arrangement_2:
 `CGAL::Arr_segment_traits_2`, or of `CGAL::Arr_non_caching_segment_traits_2`. 
 
 \tparam RegularizationCategory indicates whether the output should be regularized. It can be
-specified by one of the following: `CGAL::Tag_true` or `CGAL::Tag_false`, where `CGAL::Tag_false` is the default value.
+specified by one of the following: `#Tag_true` or `#Tag_false`, where `#Tag_false` is the default value.
 
 
 
@@ -47,12 +47,12 @@ public:
   /*! 
     See \ref Visibility_2::Supports_general_polygon_category.
   */
-  typedef ::Tag_true Supports_general_polygon_category; 
+  typedef Tag_true Supports_general_polygon_category; 
 
   /*! 
     See \ref Visibility_2::Supports_simple_polygon_category.
   */
-  typedef ::Tag_true Supports_simple_polygon_category; 
+  typedef Tag_true Supports_simple_polygon_category; 
 /// @}
 
 
diff --git a/Visibility_2/doc/Visibility_2/CGAL/Simple_polygon_visibility_2.h b/Visibility_2/doc/Visibility_2/CGAL/Simple_polygon_visibility_2.h
index 75ab4d2f311..c1a906e1433 100644
--- a/Visibility_2/doc/Visibility_2/CGAL/Simple_polygon_visibility_2.h
+++ b/Visibility_2/doc/Visibility_2/CGAL/Simple_polygon_visibility_2.h
@@ -20,7 +20,7 @@ It must be an instance of `CGAL::Arrangement_2`, where its `CGAL::Arrangement_2:
 `CGAL::Arr_segment_traits_2`, or of `CGAL::Arr_non_caching_segment_traits_2`. 
 
 \tparam RegularizationCategory indicates whether the output should be regularized. It can be
-specified by one of the following: `CGAL::Tag_true` or `CGAL::Tag_false`, where `CGAL::Tag_false` is the default value.
+specified by one of the following: `#Tag_true` or `#Tag_false`, where `#Tag_false` is the default value.
 
 
 \cgalModels `Visibility_2` 
@@ -52,12 +52,12 @@ public:
   /*! 
     See \ref Visibility_2::Supports_general_polygon_category.
   */
-  typedef ::Tag_false Supports_general_polygon_category; 
+  typedef Tag_false Supports_general_polygon_category; 
 
   /*! 
     See \ref Visibility_2::Supports_simple_polygon_category.
   */
-  typedef ::Tag_true Supports_simple_polygon_category; 
+  typedef Tag_true Supports_simple_polygon_category; 
 /// @}
 
 
diff --git a/Visibility_2/doc/Visibility_2/CGAL/Triangular_expansion_visibility_2.h b/Visibility_2/doc/Visibility_2/CGAL/Triangular_expansion_visibility_2.h
index 909ed74d016..ec9f8fdb981 100644
--- a/Visibility_2/doc/Visibility_2/CGAL/Triangular_expansion_visibility_2.h
+++ b/Visibility_2/doc/Visibility_2/CGAL/Triangular_expansion_visibility_2.h
@@ -15,7 +15,7 @@ It must be an instance of `CGAL::Arrangement_2`, where its `CGAL::Arrangement_2:
 `CGAL::Arr_segment_traits_2`, or of `CGAL::Arr_non_caching_segment_traits_2`. 
 
 \tparam RegularizationCategory indicates whether the output should be regularized. It can be
-specified by one of the following: \ref `CGAL::Tag_true` or \ref `CGAL::Tag_false`, where `CGAL::Tag_false` is the default value.
+specified by one of the following: `#Tag_true` or `#Tag_false`, where `#Tag_false` is the default value.
 
 \cgalModels `Visibility_2` 
 
@@ -49,12 +49,12 @@ public:
   /*! 
     See \ref Visibility_2::Supports_general_polygon_category.
   */
-  typedef ::Tag_true Supports_general_polygon_category; 
+  typedef Tag_true Supports_general_polygon_category; 
 
   /*! 
     See \ref Visibility_2::Supports_simple_polygon_category.
   */
-  typedef ::Tag_true Supports_simple_polygon_category; 
+  typedef Tag_true Supports_simple_polygon_category; 
 /// @}
 
 
diff --git a/Visibility_2/doc/Visibility_2/Concepts/Visibility_2.h b/Visibility_2/doc/Visibility_2/Concepts/Visibility_2.h
index 52940ab582a..60a08cca418 100644
--- a/Visibility_2/doc/Visibility_2/Concepts/Visibility_2.h
+++ b/Visibility_2/doc/Visibility_2/Concepts/Visibility_2.h
@@ -42,12 +42,12 @@ public:
 /// \name Tags 
 /// @{
   /*! 
-    identifies whether the regularized visibility area is computed (either \ref `CGAL::Tag_true` or \ref `CGAL::Tag_false`). 
+    identifies whether the regularized visibility area is computed (either `#Tag_true` or `#Tag_false`). 
   */
   typedef unspecified_type Regularization_category;
   
   /*! 
-    identifies whether general polygons (with holes) are supported (either \ref `CGAL::Tag_true` or \ref `CGAL::Tag_false`). 
+    identifies whether general polygons (with holes) are supported (either `#Tag_true` or `#Tag_false`). 
     A general polygon is represented by a face \f$ f \f$ with no 
     isolated vertex and any edge of \f$ f \f$ separates \f$ f \f$ from another face.
     Note that this allows \f$ f \f$ to touch a vertex from several sides. 
@@ -55,7 +55,7 @@ public:
   typedef unspecified_type Supports_general_polygon_category; 
 
   /*! 
-    identifies whether simple polygons are supported (either \ref` CGAL::Tag_true` or \ref `CGAL::Tag_false`). 
+    identifies whether simple polygons are supported (either `#Tag_true` or `#Tag_false`). 
 
     A simple polygon is represented by a face \f$ f \f$ with no holes, 
     no isolated vertex and any edge of \f$ f \f$ separates \f$ f \f$ from another face.