diff --git a/docs/device_registry_index.md b/docs/device_registry_index.md
index b9bd064f..617eaafe 100644
--- a/docs/device_registry_index.md
+++ b/docs/device_registry_index.md
@@ -28,7 +28,7 @@ Although not currently available, we could consider offering an option to users
 | id             | Unique ID of device (generated by Home Assistant)                                                                                                                                                                 |
 | name           | Name of this device                                                                                                                                                                                               |
 | connections    | A set of tuples of `(connection_type, connection identifier)`. Connection types are defined in the device registry module.                                                                                        |
-| identifiers    | Set of identifiers. They identify the device in the outside world. An example is a serial number.                                                                                                                 |
+| identifiers    | Set of `(DOMAIN, identifier)` tuples. Identifiers identify the device in the outside world. An example is a serial number.                                                                                                                 |
 | manufacturer   | The manufacturer of the device.                                                                                                                                                                                   |
 | model          | The model of the device.                                                                                                                                                                                          |
 | suggested_area | The suggested name for the area where the device is located.                                                                                                                                                                                          |