Update README.md

Add comment around PMS_IP and swarm services

README.md

@@ -283,7 +283,7 @@ The image extends the [LinuxServer Plex](https://hub.docker.com/r/linuxserver/pl
 | Parameter | Function |
 | :----: | --- |
 | `ORCHESTRATOR_URL` | The url where the orchestrator service can be reached (ex: http://plex-orchestrator:3500) |
-| `PMS_IP` | IP pointing at the Plex instance (can be the cluster IP) |
+| `PMS_IP` | IP pointing at the Plex instance (can be the cluster IP, a virtual IP, or the actual service name in Docker Swarm) |
 | `TRANSCODE_EAE_LOCALLY` | Force media which requires EasyAudioEncoder to transcode locally |
 | `TRANSCODE_OPERATING_MODE` | "local" => only local transcoding (no workers), "remote" => only remote workers transcoding, "both" (default) => Remote first, local if it fails |
 | `TRANSCODER_VERBOSE` | "0" (default) => info level, "1" => debug logging |