diff --git a/src/plugins/legend.js b/src/plugins/legend.js
index d2ba1987..bb1a865f 100644
--- a/src/plugins/legend.js
+++ b/src/plugins/legend.js
@@ -201,6 +201,7 @@ Legend.generateLegendHTML = function(g, x, sel_points, oneEmWidth, row) {
   var data = {
     dygraph: g,
     x: x,
+    i: row,
     series: []
   };