diff -r 262572d90bc6 -r f962e42e324d src/HOL/NSA/NSA.thy
--- a/src/HOL/NSA/NSA.thy	Sun Nov 02 17:09:04 2014 +0100
+++ b/src/HOL/NSA/NSA.thy	Sun Nov 02 17:13:28 2014 +0100
@@ -3,7 +3,7 @@
     Author:     Lawrence C Paulson, University of Cambridge
 *)
 
-header{*Infinite Numbers, Infinitesimals, Infinitely Close Relation*}
+section{*Infinite Numbers, Infinitesimals, Infinitely Close Relation*}
 
 theory NSA
 imports HyperDef "~~/src/HOL/Library/Lub_Glb"