diff -r 0baae4311a9f -r b9556a055632 src/HOL/Library/Quotient_Product.thy
--- a/src/HOL/Library/Quotient_Product.thy	Sun Nov 02 17:16:01 2014 +0100
+++ b/src/HOL/Library/Quotient_Product.thy	Sun Nov 02 17:20:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Cezary Kaliszyk and Christian Urban
 *)
 
-header {* Quotient infrastructure for the product type *}
+section {* Quotient infrastructure for the product type *}
 
 theory Quotient_Product
 imports Main Quotient_Syntax