diff --git a/js/demo/ComponentsScreenView.js b/js/demo/ComponentsScreenView.js
index fdd204852..8e593bb79 100644
--- a/js/demo/ComponentsScreenView.js
+++ b/js/demo/ComponentsScreenView.js
@@ -173,7 +173,7 @@ define( function( require ) {
       bottom: conductivityTesterNode.bottom + 100
     } );
 
-    // short-circuit check box
+    // short-circuit checkbox
     var shortCircuitProperty = new Property( false );
     shortCircuitProperty.link( function( shortCircuit ) {
       conductivityTesterNode.shortCircuit = shortCircuit;
@@ -521,7 +521,7 @@ define( function( require ) {
       rightBeamNode.visible = on;
     } );
 
-    // enabled check box
+    // enabled checkbox
     var enabledCheckbox = new Checkbox( new Text( 'enabled', { font: new PhetFont( 20 ) } ), enabledProperty, {
       centerX: layoutBounds.centerX,
       top: leftLaserNode.bottom + 40
diff --git a/js/demo/SlidersScreenView.js b/js/demo/SlidersScreenView.js
index b059ee358..efa862a4a 100644
--- a/js/demo/SlidersScreenView.js
+++ b/js/demo/SlidersScreenView.js
@@ -97,7 +97,7 @@ define( function( require ) {
       }
     }, numberControlOptions ) );
 
-    // Check box that will disable all NumberControls
+    // Checkbox that will disable all NumberControls
     var enabledCheckbox = new Checkbox( new Text( 'enabled', { font: new PhetFont( 20 ) } ), enabledProperty );
 
     return new VBox( {