--- a/ProgTutorial/Base.thy	Mon Aug 03 14:01:57 2009 +0200
+++ b/ProgTutorial/Base.thy	Mon Aug 03 16:47:01 2009 +0200
@@ -6,6 +6,7 @@
   "antiquote_setup.ML"
 begin
 
+(* re-definition of various ML antiquotations    *)
 (* to have a special tag for text enclosed in ML *)
 
 ML {*