diff --git a/static/main.js b/static/main.js
index be5b03e..01f86b4 100644
--- a/static/main.js
+++ b/static/main.js
@@ -1,3 +1,5 @@
+/* jshint esversion: 6 */
+
 var localModeEnabled = false;
 
 // References to howler objects