diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/Quickcheck_Examples/Quickcheck_Narrowing_Examples.thy
--- a/src/HOL/Quickcheck_Examples/Quickcheck_Narrowing_Examples.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Quickcheck_Examples/Quickcheck_Narrowing_Examples.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -3,7 +3,7 @@
     Copyright   2011 TU Muenchen
 *)
 
-header {* Examples for narrowing-based testing  *}
+section {* Examples for narrowing-based testing  *}
 
 theory Quickcheck_Narrowing_Examples
 imports Main