Update device_registry_index.md

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Paulus Schoutsen 2018-09-12 11:40:14 +02:00 committed by GitHub
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@ -3,6 +3,8 @@ title: Device Registry
sidebar_label: Introduction
---
> Entities can only be added to the device registry if they have been loaded via a [config entry](config_entries_index.md).
The device registry is a registry where Home Assistant keeps track of devices. A device is represented in Home Assistant via one or more entities. For example, a battery-powered temperature and a humidity sensor might expose entities for temperature, humidity and battery level.
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