Update docs/reference/docker-support.mdx

docs/reference/docker-support.mdx

@@ -213,7 +213,7 @@ If you want to set custom runtime parameters for docker, you can use the `docker
 The path points to your custom yaml file formatted as a docker-compose file. This file will be used to add to and override the default docker-compose file generated by the compiler following the [docker compose multiple file standard](https://docs.docker.com/reference/cli/docker/compose/). Specifically, the compiler generated docker-compose file and your custom docker compose file will be passed as `-f` parameters to docker compose in order.
 
 :::tip
-The service names of your custom docker-compose file should match the service names of the compiler generated docker-compose file. To be more concrete, add `federate__` prefix to reactor names in federated execution.
+The service names of your custom docker-compose file should match the service names of the compiler generated docker-compose file. Note that when your program is federated, a `federate__` prefix is used for each service that brings up a federate. For example, if your program has a top-level reactor instance named `a`, then its corresponding service name will be `federate__a`.
 :::
 
 ## Manually building and running