diff --git a/js/simula-rasa/model/SimulaRasaModel.js b/js/simula-rasa/model/SimulaRasaModel.js
index 0821d97..02aa3a3 100644
--- a/js/simula-rasa/model/SimulaRasaModel.js
+++ b/js/simula-rasa/model/SimulaRasaModel.js
@@ -21,9 +21,9 @@ define( function( require ) {
 
   return inherit( PropertySet, SimulaRasaModel, {
 
-    // Called by the animation loop. Optional, so if your model has no animation, you can omit this.
+    //TODO Called by the animation loop. Optional, so if your model has no animation, please delete this.
     step: function( dt ) {
-      // Handle model animation here.
+      //TODO Handle model animation here.
     }
   } );
 } );
\ No newline at end of file
diff --git a/js/simula-rasa/view/SimulaRasaScreenView.js b/js/simula-rasa/view/SimulaRasaScreenView.js
index 3894524..0cb7344 100644
--- a/js/simula-rasa/view/SimulaRasaScreenView.js
+++ b/js/simula-rasa/view/SimulaRasaScreenView.js
@@ -33,9 +33,9 @@ define( function( require ) {
 
   return inherit( ScreenView, SimulaRasaScreenView, {
 
-    // Called by the animation loop. Optional, so if your view has no animation, you can omit this.
+    //TODO Called by the animation loop. Optional, so if your view has no animation, please delete this.
     step: function( dt ) {
-      // Handle view animation here.
+      //TODO Handle view animation here.
     }
   } );
 } );
\ No newline at end of file