diff --git a/lemon/grid_graph.h b/lemon/grid_graph.h
--- a/lemon/grid_graph.h
+++ b/lemon/grid_graph.h
@@ -481,7 +481,7 @@
   /// origin.
   ///
   /// \image html grid_graph.png
-  /// \image latex grid_graph.eps "Grid graph" row_num=\textrow_num
+  /// \image latex grid_graph.eps "Grid graph" width=\textwidth
   ///
   /// A short example about the basic usage:
   ///\code