diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/SET_Protocol/Purchase.thy
--- a/src/HOL/SET_Protocol/Purchase.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/SET_Protocol/Purchase.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -4,7 +4,7 @@
     Author:     Lawrence C Paulson
 *)
 
-header{*Purchase Phase of SET*}
+section{*Purchase Phase of SET*}
 
 theory Purchase
 imports Public_SET