diff -r 3b9496db3fb9 -r 3390e863d796 progs/catastrophic.java
--- a/progs/catastrophic.java	Tue Sep 26 14:07:29 2017 +0100
+++ b/progs/catastrophic.java	Tue Sep 26 14:08:49 2017 +0100
@@ -8,7 +8,7 @@
 public class catastrophic {
     public static void main(String[] args) {
 
-        //we always run all the tests twice -> warmup of the JVM
+        //we always run all the tests twice -> to warmup of the JVM
         for (int runs = 0; runs < 2; runs++) {
             
             Pattern pattern = Pattern.compile("(a*)*b");
@@ -25,7 +25,8 @@
                 for (int i = 0; i < 2; i++) {
                     pattern.matcher(input).find();
                 }
-                
+
+                // Print out time
                 System.out.println(length + " " + input + ": " 
                        + ((System.nanoTime() - start) / 2000000000d) 
                        + "s");