diff -r 4a9cc8c800ae -r b22dfb6c5ff3 lemon/list_graph.h
--- a/lemon/list_graph.h	Wed Oct 18 15:18:27 2006 +0000
+++ b/lemon/list_graph.h	Fri Oct 20 12:05:54 2006 +0000
@@ -322,6 +322,10 @@
   ///also provides several additional useful extra functionalities.
   ///The most of the member functions and nested classes are
   ///documented only in the concept class.
+  ///
+  ///An important extra feature of this graph implementation is that
+  ///its maps are real \ref concept::ReferenceMap "reference map"s.
+  ///
   ///\sa concept::Graph.
 
   class ListGraph : public ExtendedListGraphBase {
@@ -743,6 +747,9 @@
 
   ///This is a simple and fast undirected graph implementation.
   ///
+  ///An important extra feature of this graph implementation is that
+  ///its maps are real \ref concept::ReferenceMap "reference map"s.
+  ///
   ///It conforms to the
   ///\ref concept::UGraph "UGraph concept".
   ///
@@ -1491,6 +1498,10 @@
   ///
   /// This is a bipartite undirected graph implementation.
   /// It is conforms to the \ref concept::BpUGraph "BpUGraph concept".
+  ///
+  ///An important extra feature of this graph implementation is that
+  ///its maps are real \ref concept::ReferenceMap "reference map"s.
+  ///
   /// \sa concept::BpUGraph.
   ///
   class ListBpUGraph : public ExtendedListBpUGraphBase {