--- a/src/HOL/Zorn.thy Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Zorn.thy Sun Nov 02 18:21:45 2014 +0100
@@ -7,7 +7,7 @@
The well-ordering theorem.
*)
-header {* Zorn's Lemma *}
+section {* Zorn's Lemma *}
theory Zorn
imports Order_Relation Hilbert_Choice