update

README.md

@@ -26,6 +26,8 @@ Notes:
 
 The initial run will be scheduled within 1 minute of the installation. If you don't want to wait, you can invoke it immediately by executing `pve-fake-subscription`.
 
+After installation, please refrain yourself from clicking the "check" button on the "Subscription" page. It will invalidate the cache and temporary revert your instance into an unlicensed status. 
+
 The fake subscription status doesn't grant you free access to the enterprise repository. You should switch to the no-subscription repository if not already done. Use the following method:
 - [Proxmox VE (PVE)](https://pve.proxmox.com/wiki/Package_Repositories#sysadmin_no_subscription_repo)
 - [Proxmox Mail Gateway (PMG)](https://pmg.proxmox.com/pmg-docs/pmg-admin-guide.html#pmg_package_repositories)