diff --git a/README.md b/README.md
index 9e984c8..638f22b 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 ## Install
 
+**NB. This sssumption is that this is to be run on a completely clean Debian installation. If you try and run it on an existing Server, it is likely to break things**
+
 From the Debian root prompt, run:
 
 `bash <(wget -qO- https://gitlab.com/ThatGuy/nextcloud-curl-installer/raw/master/installer.sh)`