diff --git a/docs/controller-skills/Client-Guides/euroscope-setup.md b/docs/controller-skills/Client-Guides/euroscope-setup.md
index 84950adf..b1a57c0e 100644
--- a/docs/controller-skills/Client-Guides/euroscope-setup.md
+++ b/docs/controller-skills/Client-Guides/euroscope-setup.md
@@ -54,6 +54,8 @@ The Skyline package is intended for initial setup of the client, or for larger c
 
     ![Sector Files](../assets/sector-files.png)
 
+!!! warning "Only replace the three files shown above. Do NOT replace the `VATNZ.prf` file"
+
 4. Open EuroScope. A dialogue will appear notifying you that the active sector file cannot be found. **Click No**.
 5. A file selection dialogue will appear. Select the new `.sct2` file, and click 'Open'.
 6. Another dialogue box will appear, notifying you that the file has been loaded. **Click Yes** to make this the new active sector file.