diff -r 1a7fe3bef514 -r c2230649a493 lemon/grid_graph.h
--- a/lemon/grid_graph.h	Thu Nov 05 15:50:01 2009 +0100
+++ b/lemon/grid_graph.h	Sun Nov 15 19:57:02 2009 +0100
@@ -503,6 +503,8 @@
   /// This type fully conforms to the \ref concepts::Graph "Graph concept".
   /// Most of its member functions and nested classes are documented
   /// only in the concept class.
+  ///
+  /// This class provides constant time counting for nodes, edges and arcs.
   class GridGraph : public ExtendedGridGraphBase {
     typedef ExtendedGridGraphBase Parent;