-20. If the key for a dnsdb lookup is not an IP address, it is used verbatim,
- without component reversal and without the addition of in-addr.arpa or
- ip6.arpa.
+20. If the key for a dnsdb PTR lookup is not an IP address, it is used
+ verbatim, without component reversal and without the addition of
+ in-addr.arpa or ip6.arpa.