diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/ex/Code_Binary_Nat_examples.thy
--- a/src/HOL/ex/Code_Binary_Nat_examples.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/ex/Code_Binary_Nat_examples.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Florian Haftmann, TU Muenchen
 *)
 
-header {* Simple examples for natural numbers implemented in binary representation. *}
+section {* Simple examples for natural numbers implemented in binary representation. *}
 
 theory Code_Binary_Nat_examples
 imports Complex_Main "~~/src/HOL/Library/Code_Binary_Nat"