diff -r c2230649a493 -r c92296660262 lemon/preflow.h
--- a/lemon/preflow.h	Sun Nov 15 19:57:02 2009 +0100
+++ b/lemon/preflow.h	Wed Nov 18 14:38:02 2009 +0100
@@ -265,7 +265,7 @@
     /// The Elevator should have standard constructor interface to be
     /// able to automatically created by the algorithm (i.e. the
     /// digraph and the maximum level should be passed to it).
-    /// However an external elevator object could also be passed to the
+    /// However, an external elevator object could also be passed to the
     /// algorithm with the \ref elevator(Elevator&) "elevator()" function
     /// before calling \ref run() or \ref init().
     /// \sa SetElevator