src/HOL/Induct/Tree.thy

--- a/src/HOL/Induct/Tree.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Induct/Tree.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -3,7 +3,7 @@
     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
 *)
 
-header {* Infinitely branching trees *}
+section {* Infinitely branching trees *}
 
 theory Tree
 imports Main