diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/Wellfounded.thy
--- a/src/HOL/Wellfounded.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Wellfounded.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -6,7 +6,7 @@
     Author:     Andrei Popescu, TU Muenchen
 *)
 
-header {*Well-founded Recursion*}
+section {*Well-founded Recursion*}
 
 theory Wellfounded
 imports Transitive_Closure