Function to add a key to existing keys list

[yogeshj83]

Is there a way by which I can add a key to the existing keys list?
E.g.

from multi_key_dict import multi_key_dict

k = multi_key_dict()
k['kilo', 'k'] = 'kilogram'

Now I want to add 'kg' in the keys list i.e. my multi_key_dict should look like
k['kilo', 'k', 'kg'] = 'kilogram'

is there a simple way to achieve this?