Hi,
in section "Specifying which fields to save" 
(https://docs.djangoproject.com/en/dev/ref/models/instances/#specifying-which-fields-to-save)
 
it reads that `update_fields` can be specified mostly for performance 
benefits...
However, I found that regarding a field with "auto_now=True" there is a 
different outcome.
IOW, specifying `update_fields` can be used to keep the old date in 
respective  "auto_now=True"-field UNLESS that field is also explicitly 
given un `update_fields`

I hope I got this correct - at least that was the impression from my own 
tests with Django 2.1. Than this should be more prominently stated in the 
documentation.

Thanks for Django.
Sebastian

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