diff --git a/index.js b/index.js
index 07a85da..7bc9433 100644
--- a/index.js
+++ b/index.js
@@ -2,3 +2,5 @@ var x = 42
 
 // this is a demo
 var colors = [ "red",, "blue" ];
+
+var primes = [2, 3, 5, , 7, 11, 11];