diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 A script to sync the Netbox device inventory to Zabbix.
 
 ## Requires pyzabbix and pynetbox.
+From now on only compatible with Netbox 3.x.
 
 ### Script settings
 #### Enviroment variables