diff --git a/lemon/bits/map_extender.h b/lemon/bits/map_extender.h
--- a/lemon/bits/map_extender.h
+++ b/lemon/bits/map_extender.h
@@ -26,14 +26,14 @@
 #include <lemon/concept_check.h>
 #include <lemon/concepts/maps.h>
 
-///\file
-///\brief Extenders for iterable maps.
+//\file
+//\brief Extenders for iterable maps.
 
 namespace lemon {
 
-  /// \ingroup graphbits
-  ///
-  /// \brief Extender for maps
+  // \ingroup graphbits
+  //
+  // \brief Extender for maps
   template <typename _Map>
   class MapExtender : public _Map {
   public:
@@ -171,9 +171,9 @@
     };
   };
 
-  /// \ingroup graphbits
-  ///
-  /// \brief Extender for maps which use a subset of the items.
+  // \ingroup graphbits
+  //
+  // \brief Extender for maps which use a subset of the items.
   template <typename _Graph, typename _Map>
   class SubMapExtender : public _Map {
   public: