diff --git a/docs/widgets/services/gluetun.md b/docs/widgets/services/gluetun.md
index 44775b158..1cc68c9ad 100644
--- a/docs/widgets/services/gluetun.md
+++ b/docs/widgets/services/gluetun.md
@@ -11,7 +11,7 @@ Learn more about [Gluetun](https://github.com/qdm12/gluetun).
 
 Allowed fields: `["public_ip", "region", "country"]`.
 
-To setup authentication, follow [the official Gluetun documentation](https://github.com/qdm12/gluetun-wiki/blob/main/setup/advanced/control-server.md#authentication).
+To setup authentication, follow [the official Gluetun documentation](https://github.com/qdm12/gluetun-wiki/blob/main/setup/advanced/control-server.md#authentication). Note that to use the api key method, you must add the route `GET /v1/publicip/ip` to the `routes` array in your Gluetun config.toml.
 
 ```yaml
 widget: