diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/Imperative_HOL/Imperative_HOL_ex.thy
--- a/src/HOL/Imperative_HOL/Imperative_HOL_ex.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Imperative_HOL/Imperative_HOL_ex.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -3,7 +3,7 @@
                 Alexander Krauss, Lukas Bulwahn & Florian Haftmann, TU Muenchen
 *)
 
-header {* Monadic imperative HOL with examples *}
+section {* Monadic imperative HOL with examples *}
 
 theory Imperative_HOL_ex
 imports Imperative_HOL Overview