diff -r da142c310d02 -r 4274224f8a7d lemon/grid_ugraph.h
--- a/lemon/grid_ugraph.h	Tue Oct 24 16:49:41 2006 +0000
+++ b/lemon/grid_ugraph.h	Tue Oct 24 17:19:16 2006 +0000
@@ -292,10 +292,10 @@
   /// }
   ///\endcode
   ///
-  /// The graph type is fully conform to the \ref concept::UGraph
+  /// The graph type is fully conform to the \ref concepts::UGraph
   /// "Undirected Graph" concept,  and it also has an
   ///important extra feature that
-  ///its maps are real \ref concept::ReferenceMap "reference map"s.
+  ///its maps are real \ref concepts::ReferenceMap "reference map"s.
   ///
   ///
   /// \author Balazs Dezso