diff -r 9537bf1c4853 -r 5b7a9633cfa8 src/HOL/Complex.thy
--- a/src/HOL/Complex.thy	Sun Nov 02 18:21:14 2014 +0100
+++ b/src/HOL/Complex.thy	Sun Nov 02 18:21:45 2014 +0100
@@ -4,7 +4,7 @@
     Conversion to Isar and new proofs by Lawrence C Paulson, 2003/4
 *)
 
-header {* Complex Numbers: Rectangular and Polar Representations *}
+section {* Complex Numbers: Rectangular and Polar Representations *}
 
 theory Complex
 imports Transcendental