src/ZF/WF.thy

--- a/src/ZF/WF.thy	Sun Nov 02 16:09:35 2014 +0100
+++ b/src/ZF/WF.thy	Sun Nov 02 16:39:54 2014 +0100
@@ -14,7 +14,7 @@
 a mess.
 *)
 
-header{*Well-Founded Recursion*}
+section{*Well-Founded Recursion*}
 
 theory WF imports Trancl begin