opps. i shouldn't have trusted it blindly.
it was trying to modify a line in /etc/dnsmasq.conf
by adding the following to dnsmasq.postconf:
pc_delete "dhcp-host=58:38:49:E8:xx:xx"
pc_insert "dhcp-host=58:38:49:E8:xx:xx,set:block_site,192.168.50.50"
block_site being a tag that supposedly is...