diff -r 0baae4311a9f -r b9556a055632 src/HOL/Library/Cardinality.thy
--- a/src/HOL/Library/Cardinality.thy	Sun Nov 02 17:16:01 2014 +0100
+++ b/src/HOL/Library/Cardinality.thy	Sun Nov 02 17:20:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Brian Huffman, Andreas Lochbihler
 *)
 
-header {* Cardinality of types *}
+section {* Cardinality of types *}
 
 theory Cardinality
 imports Phantom_Type