diff --git a/js/ComboBox.js b/js/ComboBox.js
index 1f930826..aa298706 100644
--- a/js/ComboBox.js
+++ b/js/ComboBox.js
@@ -138,8 +138,6 @@ define( require => {
           stroke: options.listStroke,
           lineWidth: options.listLineWidth,
           visible: false
-
-          //TODO sun#314 need to add a11y options?
         } );
       listParent.addChild( this.listBox );
       this.listParent = listParent; // @private
@@ -171,7 +169,6 @@ define( require => {
       this.display = null;
 
       // @private listener for 'click outside to dismiss'
-      // TODO sun#314 handle this logic for a11y too, perhaps on by monitoring the focusout event on the display's root PDOM element
       this.clickToDismissListener = {
         down: event => {
           //TODO scenery#927 is trail.nodes public? should we add Trail.containsNode?
diff --git a/js/ComboBoxButton.js b/js/ComboBoxButton.js
index 1bd96ee3..92a0ea86 100644
--- a/js/ComboBoxButton.js
+++ b/js/ComboBoxButton.js
@@ -52,7 +52,6 @@ define( require => {
         // phet-io
         tandem: Tandem.optional,
 
-        //TODO sun#314 evaluate whether these are still needed now that ComboBoxButton extends RectangularPushButton
         // a11y
         labelTagName: 'span',
         containerTagName: 'div',
@@ -160,8 +159,9 @@ define( require => {
       };
       property.link( propertyObserver );
 
-      //TODO sun#314 expand on this comment
-      // the button is labelledby its own label, and then (second) by itself. Order matters!
+      // Add aria-labelledby attribute to the button.
+      // The button is aria-labelledby its own label sibling, and then (second) its primary sibling in the PDOM.
+      // Order matters!
       assert && assert( !options.ariaLabelledbyAssociations, 'ComboBoxButton sets ariaLabelledbyAssociations' );
       this.ariaLabelledbyAssociations = [
         {
diff --git a/js/ComboBoxListBox.js b/js/ComboBoxListBox.js
index 0ac8e9cc..eb00a6e6 100644
--- a/js/ComboBoxListBox.js
+++ b/js/ComboBoxListBox.js
@@ -153,8 +153,7 @@ define( require => {
 
       super( content, options );
 
-      //TODO sun#314 say more here
-      // a11y - the list is labeled by the button's label
+      // a11y - the list box is aria-labelledby its own label sibling
       this.addAriaLabelledbyAssociation( {
         otherNode: button,
         otherElementName: AccessiblePeer.LABEL_SIBLING,