#17051: Tag ISOLATED_DEPLOYMENT as a v4.1 feature

docs/configuration/system.md

@@ -89,6 +89,8 @@ addresses (and [`DEBUG`](./development.md#debug) is true).
 
 ## ISOLATED_DEPLOYMENT
 
+!!! info "This feature was introduced in NetBox v4.1."
+
 Default: False
 
 Set this configuration parameter to True for NetBox deployments which do not have Internet access. This will disable miscellaneous functionality which depends on access to the Internet.