Keyword pupilscale doesn´t work anymore

[esoria22]

I am defining a custom optic from an analytic function from a FITS file, and the keyword pupilscale (which is explained in the docs file [https://poppy-optics.readthedocs.io/en/latest/extending.html]) doesn't work. It gives me this error message:
OpticalElement.init(self, name=name, **kwargs)

TypeError: init() got an unexpected keyword argument 'pupilscale'

It is due to a new update in the code, so it would be usefull to update in the doc too.