diff --git a/js/curve-fitting/view/BarometerR2Node.js b/js/curve-fitting/view/BarometerR2Node.js
index b7515da..883773c 100644
--- a/js/curve-fitting/view/BarometerR2Node.js
+++ b/js/curve-fitting/view/BarometerR2Node.js
@@ -55,7 +55,11 @@ define( function( require ) {
   }
 
   return inherit( Node, BarometerR2Node, {
-    // add single tick
+    /**
+     * Add single tick.
+     *
+     * @param {number} value for which necessary draw tick.
+     */
     addTick: function( value ) {
       // expression "0.5 + ( CurveFittingConstants.BAROMETER_HEIGHT - 1 )" need to prevent bad graph view in corners
       var y = 0.5 + ( CurveFittingConstants.BAROMETER_HEIGHT - 1 ) * ( value - RANGE.min ) / ( RANGE.max - RANGE.min );
@@ -69,7 +73,11 @@ define( function( require ) {
       this.addChild( new Line( -0.5, -y, CurveFittingConstants.BAROMETER_TICK_WIDTH, -y, LINE_OPTIONS ) );
     },
 
-    // add array of tick
+    /**
+     * Add array of ticks.
+     *
+     * @param {Array.<number>} arrayOfTicks - Array of number for which necessary draw tick.
+     */
     addTicks: function( arrayOfTicks ) {
       var self = this;
       arrayOfTicks.forEach( function( tickValue ) {
diff --git a/js/curve-fitting/view/BarometerX2Node.js b/js/curve-fitting/view/BarometerX2Node.js
index eccc1ec..832ba5e 100644
--- a/js/curve-fitting/view/BarometerX2Node.js
+++ b/js/curve-fitting/view/BarometerX2Node.js
@@ -42,8 +42,13 @@ define( function( require ) {
   var lowerLimitArray = [ 0.004, 0.052, 0.118, 0.178, 0.23, 0.273, 0.31, 0.342, 0.369, 0.394, 0.545, 0.695, 0.779, 0.927 ];
   var upperLimitArr = [ 3.8, 3, 2.6, 2.37, 2.21, 2.1, 2.01, 1.94, 1.88, 1.83, 1.57, 1.35, 1.24, 1.07 ];
 
-  // Convert chi values into barometer color depend on number of points.
-  // This algorithm was copied directly from flash simulation.
+  /**
+   * Convert chi values into barometer color depend on number of points.
+   * This algorithm was copied directly from flash simulation.
+   *
+   * @param {number} chiValue - Chi value.
+   * @param {number} numberOfPoints - Number of points that have been taken to plot curve.
+   */
   function getChiFillFromChiValue( chiValue, numberOfPoints ) {
     var red;
     var green;
@@ -116,7 +121,12 @@ define( function( require ) {
     return 'rgb(' + Math.round( red ) + ', ' + Math.round( green ) + ', ' + Math.round( blue ) + ')';
   }
 
-
+  /**
+   * Convert X^2 value to corresponded y position.
+   *
+   * @param {number} value - Barometer's X^2 value.
+   * @returns {number}
+   */
   function valueToYPosition( value ) {
     if ( value <= 1 ) {
       // expression "0.5 + ( HEIGHT - 1 )" need to prevent bad graph view in corners
@@ -170,7 +180,11 @@ define( function( require ) {
   }
 
   return inherit( VBox, BarometerX2Node, {
-    // add single tick
+    /**
+     * Add single tick.
+     *
+     * @param {number} value for which necessary draw tick.
+     */
     addTick: function( value ) {
       var y = valueToYPosition( value );
       var tickWidth;
@@ -190,7 +204,11 @@ define( function( require ) {
       this._content.addChild( new Line( -0.5, -y, tickWidth, -y, LINE_OPTIONS ) );
     },
 
-    // add array of tick
+    /**
+     * Add array of ticks.
+     *
+     * @param {Array.<number>} arrayOfTicks - Array of number for which necessary draw tick.
+     */
     addTicks: function( arrayOfTicks ) {
       var self = this;
       arrayOfTicks.forEach( function( tickValue ) {
diff --git a/js/curve-fitting/view/BucketAndGraphAreaNode.js b/js/curve-fitting/view/BucketAndGraphAreaNode.js
index 62cdab7..132539b 100644
--- a/js/curve-fitting/view/BucketAndGraphAreaNode.js
+++ b/js/curve-fitting/view/BucketAndGraphAreaNode.js
@@ -26,8 +26,6 @@ define( function( require ) {
    * @constructor
    */
   function BucketAndGraphAreaNode( curveFittingModel, modelViewTransform, options ) {
-    var self = this;
-
     // create bucket node
     var bucketNode = new BucketNode( curveFittingModel.bucket, modelViewTransform );
 
diff --git a/js/curve-fitting/view/GraphAreaNode.js b/js/curve-fitting/view/GraphAreaNode.js
index 5b2d1c0..c284b80 100644
--- a/js/curve-fitting/view/GraphAreaNode.js
+++ b/js/curve-fitting/view/GraphAreaNode.js
@@ -157,7 +157,12 @@ define( function( require ) {
   }
 
   return inherit( Node, GraphAreaNode, {
-    // convert graph values to global coordinates
+    /**
+     * Convert global coordinates to graph values.
+     *
+     * @param {Vector2} globalPosition - Global point position.
+     * @returns {Object}
+     */
     getGraphValuesFromPosition: function( globalPosition ) {
       var locPosition = this.globalToParentPoint( globalPosition );
 
@@ -167,6 +172,13 @@ define( function( require ) {
       };
     },
 
+    /**
+     * Convert graph values to global coordinates.
+     *
+     * @param {number} x graph value.
+     * @param {number} y graph value.
+     * @returns {Vector2}
+     */
     // convert global coordinates to graph values
     getPositionFromGraphValues: function( x, y ) {
       return new Vector2(
@@ -175,7 +187,12 @@ define( function( require ) {
       );
     },
 
-    // whether the point is inside the GraphAreaNode (or on the boundary)
+    /**
+     * Check is point inside the GraphAreaNode (or on the boundary).
+     *
+     * @param {Vector2} pointPosition - Position of point that need to check.
+     * @returns {boolean}
+     */
     isPointInsideGraph: function( pointPosition ) {
       return this.localBounds.containsPoint( this.globalToLocalPoint( pointPosition ) );
     }