Add docs about casting

docs/docs/integrations/home-assistant.md

@@ -85,6 +85,12 @@ The integration provides:
 
 This is accessible via "Media Browser" on the left menu panel in Home Assistant.
 
+## Casting Clips To Media Devices
+
+The integration supports casting clips and cameras to supported media devices.
+
+**NOTE: For clips to be castable to media devices, audio is required and may need to be [enabled for recordings](../faqs.md#audio-in-recordings). 
+
 <a name="api"></a>
 
 ## Notification API