diff --git a/app/assets/javascripts/graphs/width_scale.js b/app/assets/javascripts/graphs/width_scale.js
index 4a5c71e19..891cfaf96 100644
--- a/app/assets/javascripts/graphs/width_scale.js
+++ b/app/assets/javascripts/graphs/width_scale.js
@@ -10,6 +10,10 @@ to the display size of the svg
 
   var growstuff = (window.growstuff = window.growstuff || {});
 
+  /**
+   * Object for WidthScale
+   * @param {?} data Graph data
+   */
   function WidthScale(data) {
     this._data = data;
   }