diff --git a/app/assets/javascripts/graphs/bar_group.js b/app/assets/javascripts/graphs/bar_group.js
index 312fcd6f3..cb6bf0ef6 100644
--- a/app/assets/javascripts/graphs/bar_group.js
+++ b/app/assets/javascripts/graphs/bar_group.js
@@ -15,7 +15,7 @@
 
 /**
  * data object for bar group
- * @param {int} data The graph data
+ * @param {Object} graph configuration
  */
 function BarGroup(data) {
   this._data = data;
diff --git a/app/assets/javascripts/graphs/height_scale.js b/app/assets/javascripts/graphs/height_scale.js
index 8abc636c9..c4034a349 100644
--- a/app/assets/javascripts/graphs/height_scale.js
+++ b/app/assets/javascripts/graphs/height_scale.js
@@ -12,6 +12,7 @@ the svg
 
   /**
    * new heighscale object
+   * @param {Object} data Graph configuration
    */
   function HeightScale(data) {
     this._data = data;
diff --git a/app/assets/javascripts/graphs/horizontal_bar_graph.js b/app/assets/javascripts/graphs/horizontal_bar_graph.js
index 856bca885..12dcae588 100644
--- a/app/assets/javascripts/graphs/horizontal_bar_graph.js
+++ b/app/assets/javascripts/graphs/horizontal_bar_graph.js
@@ -19,7 +19,7 @@ The main dimensions of the graph are rendered here.
 
   /**
    * create a new graph object
-   * @param {??} bar graph data
+   * @param {Object} data Graph configuration
    */
   function HorizontalBarGraph(data) {
     this._data = data;
diff --git a/app/assets/javascripts/graphs/width_scale.js b/app/assets/javascripts/graphs/width_scale.js
index 891cfaf96..3ddd0decf 100644
--- a/app/assets/javascripts/graphs/width_scale.js
+++ b/app/assets/javascripts/graphs/width_scale.js
@@ -12,7 +12,7 @@ to the display size of the svg
 
   /**
    * Object for WidthScale
-   * @param {?} data Graph data
+   * @param {Object} data Graph configuration
    */
   function WidthScale(data) {
     this._data = data;