--- a/src/HOL/Option.thy Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Option.thy Sun Nov 02 18:21:45 2014 +0100
@@ -2,7 +2,7 @@
Author: Folklore
*)
-header {* Datatype option *}
+section {* Datatype option *}
theory Option
imports BNF_Least_Fixpoint Finite_Set