diff --git a/lemon/grid_graph.h b/lemon/grid_graph.h
--- a/lemon/grid_graph.h
+++ b/lemon/grid_graph.h
@@ -497,9 +497,7 @@
   ///\endcode
   ///
   /// This graph type fully conforms to the \ref concepts::Graph
-  /// "Graph" concept, and it also has an important extra feature
-  /// that its maps are real \ref concepts::ReferenceMap
-  /// "reference map"s.
+  /// "Graph concept".
   class GridGraph : public ExtendedGridGraphBase {
   public: