update EAGER_SERVICE_LOADING

Author: bentsku

content/en/references/configuration.md

@@ -39,7 +39,7 @@ Options that affect the core LocalStack system.
 | `LS_LOG` | `trace`, `trace-internal`, `debug`, `info`, `warn`, `error`, `warning`| Specify the log level. Currently overrides the `DEBUG` configuration. `trace` for detailed request/response, `trace-internal` for internal calls, too. |
 | `EXTERNAL_SERVICE_PORTS_START` | `4510` (default) | Start of the [External Service Port Range]({{< ref "external-ports" >}}) (inclusive). |
 | `EXTERNAL_SERVICE_PORTS_END` | `4560` (default) | End of the [External Service Port Range]({{< ref "external-ports" >}}) (exclusive). |
-| `EAGER_SERVICE_LOADING` | `0` (default) \|`1` | Boolean that toggles lazy loading of services. If eager loading is enabled, services are started at LocalStack startup rather than their first use. Be aware that eager loading increases the LocalStack startup time. |
+| `EAGER_SERVICE_LOADING` | `0` (default) \|`1` | Boolean that toggles lazy loading of services. Needs to be used in combination with `SERVICES`. If eager loading is enabled, services are started at LocalStack startup rather than their first use. Be aware that eager loading increases the LocalStack startup time. |
 | `SERVICES`| `s3,sqs` | A comma-delimited string of services. Check the [internal health endpoint]({{< ref "internal-endpoints/#localstack-endpoints" >}}) `/_localstack/health` for valid service names. If `SERVICES` is set LocalStack will only load the listed services. All other services will be disabled and cannot be used. |
 | `ALLOW_NONSTANDARD_REGIONS` | `0` (default) | Allows the use of non-standard AWS regions. By default, LocalStack only accepts [standard AWS regions](https://docs.aws.amazon.com/general/latest/gr/rande.html). |
 | `PARITY_AWS_ACCESS_KEY_ID` | `0` (default) | Enables the use production-like access key IDs. By default, LocalStack issues keys with `LSIA...` and `LKIA...` prefix, and will reject keys that start with `ASIA...` or `AKIA...`. |