diff -r c0bdd4ad69ca -r d94fdbef1a4f progs/catastrophic/catastrophic.js
--- a/progs/catastrophic/catastrophic.js	Tue Sep 01 16:00:37 2020 +0100
+++ b/progs/catastrophic/catastrophic.js	Wed Sep 02 23:34:19 2020 +0100
@@ -7,11 +7,11 @@
 //
 // call with:
 //
-//  $> catastrophic.js 20
+//  $> ./catastrophic.js 20
 //
 // call with timing as:
 //
-//  $> time catastrophic.js 25
+//  $> time ./catastrophic.js 25
 
 
 const args = process.argv[2]