diff --git a/Triangulation/doc/Triangulation/CGAL/Regular_triangulation_traits_adapter.h b/Triangulation/doc/Triangulation/CGAL/Regular_triangulation_traits_adapter.h
index f419eac1e91..d255c317f96 100644
--- a/Triangulation/doc/Triangulation/CGAL/Regular_triangulation_traits_adapter.h
+++ b/Triangulation/doc/Triangulation/CGAL/Regular_triangulation_traits_adapter.h
@@ -35,6 +35,11 @@ public:
   /// \name Types
   /// @{
 
+  /*!
+  The base traits.
+  */
+  typedef RTTraits                                  Base;
+  
   /*!
   The weighted point type.
   */