Confusing parental-source documentation

parental-source determines which local source address, and optionally UDP port, is used to send parental DS queries. This address must appear in the secondary server’s parental-agents zone clause. This statement sets the parental-source for all zones, but can be overridden on a per-zone or per-view basis by including a parental-source statement within the zone or view block in the configuration file.

The bold line is a copy paste error from notify-source.