Add documentation for new option

docs/deployment/reference.md

@@ -44,6 +44,7 @@ parameters for the [rabbitMQ](https://github.com/bitnami/charts/tree/master/bitn
 | `app.defaultDIDFinderScheme`               | DID Finder scheme if none provided in request. If left blank, template will attempt to guess.                                                                       | -                                              |
 | `app.validateTransformerImage`             | Should docker image name be validated at DockerHub?                                                                                                                 | `true`                                         |
  | `app.defaultUsers`                         | Name of secret holding json file with default users to create on deployment                                                                                         | -                                              |
+| `app.sqlalchemyEngineOptions`              | String that will be interpreted as a Python dict, giving keyword arguments to the `sqlalchemy.create_engine()` function for the internal database. | - |
 | `didFinder.rucio.enabled`                  | Should we deploy the Rucio DID Finder?                                                                                                                              | `true`                                         |
 | `didFinder.rucio.image`                    | Rucio DID Finder image name                                                                                                                                         | `sslhep/servicex-did-finder`                   |
 | `didFinder.rucio.tag`                      | Rucio DID Finder image tag                                                                                                                                          | `latest`                                       |