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Update device_registry_index.md

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docs/device_registry_index.md
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@ -3,8 +3,6 @@ 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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@ -25,6 +23,8 @@ The device registry is a registry where Home Assistant keeps track of devices. A
## Defining devices
> Entity device info is only read if the entity is loaded via a [config entry](config_entries_index.md).
Each entity is able to define a device via the `device_info` property. This property is read when an entity is added to Home Assistant via a config entry. A device will be be matched up with an existing device via supplied identifiers and connections, like serial numbers or MAC addresses.
```python