Actually, it's five, or even six. systemd doco is bad at including /usr/local/ . You are pointing to the wrong manual page, incidentally. It's resolved.conf(

Actually, it's five, or even six. systemd doco is bad at including /usr/local/ . You are pointing to the wrong manual page, incidentally. It's resolved.conf(5). This fails to list /usr/local/lib/systemd/resolved.conf.d/ , which is scanned before /usr/lib/systemd/resolved.conf.d/ (and if configured /lib/systemd/resolved.conf.d/).