diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/Semiring_Normalization.thy
--- a/src/HOL/Semiring_Normalization.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Semiring_Normalization.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Amine Chaieb, TU Muenchen
 *)
 
-header {* Semiring normalization *}
+section {* Semiring normalization *}
 
 theory Semiring_Normalization
 imports Numeral_Simprocs Nat_Transfer