Asuswrt integration missing

Hi. the docs for asuswrt integration say it is configurable by UI. But on my system there is no Asuswrt integration present. Can anyone tell me how to enable it?
Hassio on rpi3.
Core-2021.5.1

Configuration

To add your ASUSWRT devices into your Home Assistant installation, go to:

ConfigurationIntegrations in the UI, click the button with + sign and from the list of integrations select ASUSWRT.

That’s the problem. There is no Asuswrt there.

You have an older version, but as far as I can see, the integration should be UI configurable since 2021.3.

Here is a screenshot of mine

Thx for the help. I updated core and now it is there. Information of minimal version should be on the integration help page.

It is:
image

The documentation details (including the fact that it can be configured via GUI) always relate to the latest version, though.