Update README.md

Author: Tontonjo

README.md

@@ -19,6 +19,9 @@ It automatically will find if the host is a pve or a pbs host and setup accordin
 ### Demonstration:  
 You can watch a demonstration of the tool [in this playlist](https://www.youtube.com/playlist?list=PLU73OWQhDzsTpLpVNspJ14rVrXAmo2Biu) 
 
+### Prerequisits:
+To fully enjoye Proxmox Toolbox, an internet connexion is needed in order to retreive new needed packages and update
+
 ## Features are:
 - Automatic PVE / PBS host detection
 - Hide enterprise repo and set no-subscription repository