diff --git a/README.md b/README.md
index 04c6126..49d8cf2 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,10 @@
-## mailGraph (v1.22)
+## mailGraph (v1.25)
 Zabbix Media module and scripts for sending e-mail alerts with graphs.
 
 **Please use the Wiki for information on how to install, configure and use MailGraph in Zabbix.**
 
+## Upgrade notes
+Per v1.25 the template data provisioning and code has fundamentally changed. If you upgrade to v1.25, make sure you understand the changes in templates/html.template (now making use of arrays for lists of items).
+
 ## Example message
 [![](images/Example-mail-message-v122.png?raw=true)](images/Example-mail-message-v122.png)