@Eric89GXL how is this?
```
    Notes
    -----
    When no structural MRI is available for a subject, an average brain can be
    substituted. Freesurfer comes with such an average brain model, and MNE
    comes with some auxiliary files which make coregistration easier.
    :py:func:`create_default_subject` copies the relevant files from Freesurfer
    into the current subjects_dir, and also adds the auxiliary files provided
    by MNE.
```