diff --git a/proposal/tracking-attributes/proposal.md b/proposal/tracking-attributes/proposal.md
index ad54957..d0437b3 100644
--- a/proposal/tracking-attributes/proposal.md
+++ b/proposal/tracking-attributes/proposal.md
@@ -15,21 +15,21 @@
            </FeatureGroup>  
        </FeatureGroups>  
        <Attributes>  
-           <Attribute Name="TrackerID" Pretty="Dim" Feature="Tracking.Tracking" />  
-           <Attribute Name="TrackerCrossFade" Pretty="Dim" Feature="Tracking.Tracking" />  
-           <Attribute Name="TrackerTime" Pretty="Dim" Feature="Tracking.Tracking" />  
-           <Attribute Name="TrackerOffsetX" Pretty="Dim" Feature="Tracking.Tracking" />  
-           <Attribute Name="TrackerOffsetY" Pretty="Dim" Feature="Tracking.Tracking" />  
-           <Attribute Name="TrackerOffsetZ" Pretty="Dim" Feature="Tracking.Tracking" />  
-           <Attribute Name="TrackerMode" Pretty="Dim" Feature="Tracking.Tracking" />  
+           <Attribute Name="TrackerID" Pretty="TID" Feature="Tracking.Tracking" PhysicalUnit="None"/>  
+           <Attribute Name="TrackerCrossFade" Pretty="" Feature="Tracking.Tracking" PhysicalUnit="Percent"/>  
+           <Attribute Name="TrackerTime" Pretty="Dim" Feature="Tracking.Tracking" PhysicalUnit="Time"/>  
+           <Attribute Name="TrackerOffsetX" Pretty="Dim" Feature="Tracking.Tracking" PhysicalUnit="Length"/>  
+           <Attribute Name="TrackerOffsetY" Pretty="Dim" Feature="Tracking.Tracking" PhysicalUnit="Length"/>  
+           <Attribute Name="TrackerOffsetZ" Pretty="Dim" Feature="Tracking.Tracking" PhysicalUnit="Length"/>  
+           <Attribute Name="TrackerMode" Pretty="Dim" Feature="Tracking.Tracking" PhysicalUnit="None"/>  
 
-           <Attribute Name="TrackerControlHeight" Pretty="Dim" Feature="Tracking.TrackingControl" />  
-           <Attribute Name="TrackerControlSpeed" Pretty="Dim" Feature="Tracking.TrackingControl" />  
-           <Attribute Name="TrackerControlFreeze" Pretty="Dim" Feature="Tracking.TrackingControl" />  
-           <Attribute Name="TrackerControlBeamSize" Pretty="Dim" Feature="Tracking.TrackingControl" />  
-           <Attribute Name="TrackerControlMode" Pretty="Dim" Feature="Tracking.TrackingControl" />  
+           <Attribute Name="TrackerControlHeight" Pretty="Dim" Feature="Tracking.TrackingControl" PhysicalUnit="Length"/>  
+           <Attribute Name="TrackerControlSpeed" Pretty="Dim" Feature="Tracking.TrackingControl" PhysicalUnit="Speed"/>  
+           <Attribute Name="TrackerControlFreeze" Pretty="Dim" Feature="Tracking.TrackingControl" PhysicalUnit="None"/>  
+           <Attribute Name="TrackerControlBeamSize" Pretty="Dim" Feature="Tracking.TrackingControl" PhysicalUnit="Length"/>  
+           <Attribute Name="TrackerControlMode" Pretty="Dim" Feature="Tracking.TrackingControl" PhysicalUnit="None"/>  
 
-           <Attribute Name="TrackerControlShow" Pretty="Dim" Feature="Tracking.TrackingControl" />  
+           <Attribute Name="TrackerControlShow" Pretty="Dim" Feature="Tracking.TrackingControl" PhysicalUnit="None"/>  
        </Attributes>  
    </AttributeDefinitions>
 ```
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