Add notes to README.md

kubernetes-sigs · Sep 12, 2020 · 323da6b · 323da6b
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@@ -216,6 +216,8 @@ The [tutorials](docs/tutorials) section contains examples, including Ingress res
 
 If using a txt registry and attempting to use a CNAME the `--txt-prefix` must be set to avoid conflicts.  Changing `--txt-prefix` will result in lost ownership over previously created records.
 
+If `externalIPs` list is defined for a `LoadBalancer` service, this list will be used instead of an assigned load balancer IP to create a DNS record. It's useful when you run bare metal Kubernetes clusters behind NAT or in a similar setup, where a load balancer IP differs from a public IP (e.g. with [MetalLB](https://metallb.universe.tf)).
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 # Roadmap
 
 ExternalDNS was built with extensibility in mind. Adding and experimenting with new DNS providers and sources of desired DNS records should be as easy as possible. It should also be possible to modify how ExternalDNS behaves—e.g. whether it should add records but never delete them.