diff -r 143c85e3cdb5 -r 0baae4311a9f src/HOL/HOLCF/Library/Sum_Cpo.thy
--- a/src/HOL/HOLCF/Library/Sum_Cpo.thy	Sun Nov 02 17:14:15 2014 +0100
+++ b/src/HOL/HOLCF/Library/Sum_Cpo.thy	Sun Nov 02 17:16:01 2014 +0100
@@ -2,7 +2,7 @@
     Author:     Brian Huffman
 *)
 
-header {* The cpo of disjoint sums *}
+section {* The cpo of disjoint sums *}
 
 theory Sum_Cpo
 imports HOLCF