I just made a couple of relatively minor edits to the page (20140402): First, admins shouldn't edit files in /lib/modprobe.d/ - those get overwritten on package upgrades; only /etc/modprobe.d/ or /run/modprobe.d/ should be used for local sysadmin edits, as they are not overwritten on upgrades. However, /run is on a tmpfs, so it is not persistent across reboots; as such, it would applicable for e.g. rules that are auto-generated on system startup based on some nonstable attributes (whether that's a good idea is another discussion entirely, but I think not). Given all of that, /etc/modprobe.d/ is the best location -- its intent is for sysadmins to copy files from /lib/modprobe.d/ and edit the copies if needed (same-named files in both /etc/modprobe.d/ and /lib/modprobe.d/ are handled such that the file in /etc/modprobe.d/ takes precedence). This leads up to my second point: Second, since there's no need in this particular case to override *all* of what's in /lib/modprobe.d/blacklist.conf (you only want to *add* content to it), it's a bit cleaner to just create a new file in /etc/modprobe.d/ with a sensible name and put what you want in it.