diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/FOLP/ex/Intro.thy
--- a/src/FOLP/ex/Intro.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/FOLP/ex/Intro.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -5,7 +5,7 @@
 Derives some inference rules, illustrating the use of definitions.
 *)
 
-header {* Examples for the manual ``Introduction to Isabelle'' *}
+section {* Examples for the manual ``Introduction to Isabelle'' *}
 
 theory Intro
 imports FOLP