diff -r b6a68c15a6a3 -r 96efb4fa0736 lemon/concept/graph.h
--- a/lemon/concept/graph.h	Fri Jun 30 12:15:45 2006 +0000
+++ b/lemon/concept/graph.h	Tue Jul 04 17:49:01 2006 +0000
@@ -59,24 +59,15 @@
     /// \addtogroup graph_concepts
     /// @{
 
-    /// An empty graph class.
-  
-    /// This class provides all the common features of a graph structure,
-    /// however completely without implementations and real data structures
-    /// behind the interface.
-    /// All graph algorithms should compile with this class, but it will not
-    /// run properly, of course.
+    /// The directed graph concept
+
+    /// This class describes the \ref concept "concept" of the
+    /// immutable directed graphs.
     ///
-    /// It can be used for checking the interface compatibility,
-    /// or it can serve as a skeleton of a new graph structure.
-    /// 
-    /// Also, you will find here the full documentation of a certain graph
-    /// feature, the documentation of a real graph imlementation
-    /// like @ref ListGraph or
-    /// @ref SmartGraph will just refer to this structure.
+    /// Note that actual graph implementation like @ref ListGraph or
+    /// @ref SmartGraph may have several additional functionality.
     ///
-    /// \todo A pages describing the concept of concept description would
-    /// be nice.
+    /// \sa concept
     class Graph {
     public:
       ///\e