--- a/index.html	Thu Dec 29 20:04:54 2011 +0000
+++ b/index.html	Fri Jan 06 18:37:52 2012 +0000
@@ -189,7 +189,7 @@
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 <B>Myhill-Nerode and Regular Expressions</B> 
-Out of frustration of having to teach reasoning in theorem provers using worn-out examples like
+Out of frustration of having to teach reasoning in theorem provers with worn-out examples like
 fib and even/odd, we implemented a large part of regular language theory in Isabelle/HOL.
 This <A HREF="http://afp.sourceforge.net/devel-entries/Myhill-Nerode.shtml">implementation</A> 
 gives rise to much more interesting examples, as shown 
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