diff --git a/README.md b/README.md
index 9856d4ff9df92fd846bd60ddbbf12c6948d9629c..fee65a20893d902cd2bc346bc7be03d89df29058 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 The OpenAppStack bootstrap script allows you to easily set up a new OpenAppStack cluster.
 
+> **WARNING: The installation process will make substantial changes to the server’s configuration, so please ONLY install OAS in a testing environment.**
 
 Please refer to https://openappstack.net/documentation.html for further details,
 and to https://openappstack.net/tutorial.html for a step by step installation tutorial