diff -r b9556a055632 -r 6e2010ab8bd9 src/HOL/Isar_Examples/Basic_Logic.thy
--- a/src/HOL/Isar_Examples/Basic_Logic.thy	Sun Nov 02 17:20:45 2014 +0100
+++ b/src/HOL/Isar_Examples/Basic_Logic.thy	Sun Nov 02 17:23:48 2014 +0100
@@ -4,7 +4,7 @@
 Basic propositional and quantifier reasoning.
 *)
 
-header \<open>Basic logical reasoning\<close>
+section \<open>Basic logical reasoning\<close>
 
 theory Basic_Logic
 imports Main