You want to add an entry like below, probably in the `config_options` part (see e.g. the `robot` entry):

```python
'module-footer': ("Path to file specifying footer to be added to all generated module files",
                  None, 'store_or_None', None, {'metavar': "PATH"}),
```

Check with `eb --help` if the output is as you would expect:

```
$ eb --help | grep module-footer -A 2
    --module-footer=PATH
                        Path to file specifying footer to be added to all
                        generated module files
```