diff --git a/greenhouse-effect_a11y_view.html b/greenhouse-effect_a11y_view.html
index 61d5cccd..8411b7b5 100644
--- a/greenhouse-effect_a11y_view.html
+++ b/greenhouse-effect_a11y_view.html
@@ -492,7 +492,7 @@ <h3>PDOM & Descriptions for Greenhouse Effect</h3>
 
       const simFrame = document.getElementById( 'iframe' );
       const innerWindow = simFrame.contentWindow;
-      const PDOMRoot = innerWindow.phet.joist.sim.display.accessibleDOMElement; // copy of the parallel DOM
+      const PDOMRoot = innerWindow.phet.joist.display.accessibleDOMElement; // copy of the parallel DOM
 
       // get the alert dom elements from the iframe's inner document
       const ariaLiveElementsContainer = innerWindow.phet.joist.sim.utteranceQueue.getAriaLiveContainer();