Opportunistic Encryption and djbdns

I'm attempting to try out Opportunistic Encryption on my
local network.
I have a dns server set up running djbdns with what I
thought was all
the TXT records I would need. The output of ipsec verify
however is a
little confusing:

Opportunistic Encryption DNS checks:
   Looking for TXT in forward dns zone: lithium             
   [OK]
   Does the machine have at least one non-private address?  
   [OK]
   Looking for TXT in reverse dns zone:
d.c.b.a.in-addr.arpa.   [OK]
Looking for TXT in reverse dns zone: net.mydomain.in-addr.arpa.
[MISSING]

What is that fourth check looking for exactly? I have a TXT
record for
c.b.a.in-addr.arpa, I tried inserting a record for
net.mydomain.in-addr.arpa, but that didn't work either.

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