diff --git a/FAQ.md b/FAQ.md
index 471810c..94e86d7 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -725,6 +725,8 @@ Please follow [this link](https://rustdesk.com/docs/en/self-host/rustdesk-server
 
 It won't generate new license key, it will renew / upgrade your current license.
 
+The upgrade will also extend your license expiry to a full year, so you will see the charge higher than your expectation, it is not a bug, and the calculation is correct.
+
 After payment, you need to proceed to the web console to activate it manually as below. Just click on Edit, then OK, no need to edit anything, because your license key remains the same.
 
 ![image](https://github.com/user-attachments/assets/7f2e6ded-881e-4ac8-b446-e7c132f29a63)