Update README.md

README.md

@@ -17,7 +17,9 @@ uncomment the `build` lines in the `docker-compose.yml`.
 ## Setup
 
 1. Create a file called `.env` from the `example.env` template and adjust the detector
-   ID and the IP/port of the servers.
+   ID and the IP/port of the servers and also the `KM3MON_VERSION` variable, which should
+   ideally be set to the latest version. This determines the Docker images to be used
+   for each service.
 
 2. Next, create a `backend/supervisord.conf` from the template file
    `backend/supervisord.conf.example` and adjust if needed.