would it make sense to change the phrasing of [1] from
> add this line to your `sources.list`
to
> add this line to your `/etc/apt/sources.list` file
?
and mention, that one requires super-cow powers to do so.
for old Debianistas, this is quite obvious, but not so for newcomers.
gfmdsa
IOhannes
[1] https://backports.debian.org/Instructions/#index2h2