diff -r 0baae4311a9f -r b9556a055632 src/HOL/Library/Code_Binary_Nat.thy
--- a/src/HOL/Library/Code_Binary_Nat.thy	Sun Nov 02 17:16:01 2014 +0100
+++ b/src/HOL/Library/Code_Binary_Nat.thy	Sun Nov 02 17:20:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Florian Haftmann, TU Muenchen
 *)
 
-header {* Implementation of natural numbers as binary numerals *}
+section {* Implementation of natural numbers as binary numerals *}
 
 theory Code_Binary_Nat
 imports Code_Abstract_Nat