--- a/progs/catastrophic/catastrophic.rb	Mon Jul 27 11:02:48 2020 +0100
+++ b/progs/catastrophic/catastrophic.rb	Thu Jul 30 13:50:54 2020 +0100
@@ -8,7 +8,7 @@
 #
 # run on the command line with:
 #
-# $>  ruby catastrophic.rb
+# ruby catastrophic.rb
 #
 
 nums = (1..1000)