diff -r 0baae4311a9f -r b9556a055632 src/HOL/Library/Product_Order.thy
--- a/src/HOL/Library/Product_Order.thy	Sun Nov 02 17:16:01 2014 +0100
+++ b/src/HOL/Library/Product_Order.thy	Sun Nov 02 17:20:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Brian Huffman
 *)
 
-header {* Pointwise order on product types *}
+section {* Pointwise order on product types *}
 
 theory Product_Order
 imports Product_plus Conditionally_Complete_Lattices