Corrected kiosk mode config (#5281)

Icinga · Oct 30, 2024 · 2864e60 · 2864e60
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diff --git a/doc/20-Advanced-Topics.md b/doc/20-Advanced-Topics.md
@@ -425,6 +425,9 @@ If you want to show a specific Dashboard you can enforce this onto the kiosk use
 
 Replace Remote_Addr with the IP where the kiosk user is accessing the Web to restrict further usage from other IPs.
 
+Using the `REMOTE_USER` variable also requires adding an external backend to `authentication.ini`, as shown [here](05-Authentication.md#external-authentication-)
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 ## Customizing the Landing Page <a id="landing-page"></a>
 
 The default landing page of `dashboard` can be customized using the environment variable `ICINGAWEB_LANDING_PAGE`.