diff -r b503da67d2f7 -r 65a546c2b8ed ex/qsort.thy
--- a/ex/qsort.thy	Mon Jan 24 16:00:37 1994 +0100
+++ b/ex/qsort.thy	Mon Jan 24 16:03:03 1994 +0100
@@ -1,3 +1,11 @@
+(*  Title: 	HOL/ex/qsort.thy
+    ID:         $Id$
+    Author: 	Tobias Nipkow
+    Copyright   1994 TU Muenchen
+
+Quicksort
+*)
+
 Qsort = List +
 consts
   sorted :: "[['a,'a] => bool, 'a list] => bool"