diff --git a/src/web/js/azkaban/view/time-graph.js b/src/web/js/azkaban/view/time-graph.js
index f669a4f..5466db3 100644
--- a/src/web/js/azkaban/view/time-graph.js
+++ b/src/web/js/azkaban/view/time-graph.js
@@ -34,7 +34,11 @@ azkaban.TimeGraphView = Backbone.View.extend({
return;
}
+ // Array of points to be passed to Morris.
var data = [];
+
+ // Map of y value to index for faster look-up in the lineColorsCallback to
+ // get the status for each point.
var indexMap = {};
for (var i = 0; i < series.length; ++i) {
if (series[i].startTime == null || series[i].endTime == null) {
