Passport update on PR

Hi All,

I have a question on passport update on PR. My wife's passport had expired, and when I checked the options, I could see there are 2 options:

1. Update directly in ImmiAccount
OR
2. Fill up Form 929 and mail to [email protected].

In the second option, they say that the passport scan copy should be attached. (see below). Why is the passport scan copy not required in the first case ?

Thanks
Joby

Note: We can accept scanned, photographed or electronically signed completed forms. If you have been issued a new passport, please provide a scanned copy or photograph of the biographical page of your new passport with the completed form. The biographical page of your passport is the page that contains your photograph, personal details and the issue/expiry dates