diff --git a/js/common/model/GravityAndOrbitsClock.ts b/js/common/model/GravityAndOrbitsClock.ts
index c9e7baba..4f508617 100644
--- a/js/common/model/GravityAndOrbitsClock.ts
+++ b/js/common/model/GravityAndOrbitsClock.ts
@@ -52,7 +52,7 @@ class GravityAndOrbitsClock {
 
     this.isRunningProperty = new BooleanProperty( false, {
       tandem: tandem.createTandem( 'isRunningProperty' ),
-      phetioDocumentation: `This value is true when '${sceneTandem.phetioID}' is the selected scene and the play/pause button is in play mode. (It remains true even if the user switches screens. Use in combination with '${phet.joist.sim.screenProperty.tandem.phetioID}'.)`,
+      phetioDocumentation: `This value is true when '${sceneTandem.phetioID}' is the selected scene and the play/pause button is in play mode. (It remains true even if the user switches screens. Use in combination with '${phet.joist.sim.selectedScreenProperty.tandem.phetioID}'.)`,
       phetioReadOnly: true
     } );
     this.timeProperty = new NumberProperty( 0, {
diff --git a/js/common/model/GravityAndOrbitsModel.ts b/js/common/model/GravityAndOrbitsModel.ts
index db79744e..5c4ac7e3 100644
--- a/js/common/model/GravityAndOrbitsModel.ts
+++ b/js/common/model/GravityAndOrbitsModel.ts
@@ -61,10 +61,10 @@ class GravityAndOrbitsModel {
     this.showMassProperty = new BooleanProperty( false, { tandem: showMassCheckbox ? tandem.createTandem( 'showMassProperty' ) : Tandem.OPTIONAL } );
     this.showMeasuringTapeProperty = new BooleanProperty( false, { tandem: showMeasuringTape ? tandem.createTandem( 'showMeasuringTapeProperty' ) : Tandem.OPTIONAL } );
 
-    assert && assert( phet.joist.sim.screenProperty, 'sim should exist by now' );
+    assert && assert( phet.joist.sim.selectedScreenProperty, 'sim should exist by now' );
     this.isPlayingProperty = new BooleanProperty( false, {
       tandem: tandem.createTandem( 'isPlayingProperty' ),
-      phetioDocumentation: `This value is true if the play/pause button on this screen is in play mode. (It remains true even if the user switches screens. Use in combination with '${phet.joist.sim.screenProperty.tandem.phetioID}'.)`
+      phetioDocumentation: `This value is true if the play/pause button on this screen is in play mode. (It remains true even if the user switches screens. Use in combination with '${phet.joist.sim.selectedScreenProperty.tandem.phetioID}'.)`
     } );
 
     this.timeSpeedProperty = new EnumerationProperty( TimeSpeed.NORMAL, {