NSD3 and Glue

I noticed that NSD3 isn't returning glue with the nameservers.

In my zone I have NS records for the linode nameservers:

 <snip>@               NS      ns1.linode.com.
@               NS      ns2.linode.com.
@               NS      ns3.linode.com.
@               NS      ns4.linode.com.
@               NS      ns5.linode.com.</snip> 

I have corresponding A records for the nameservers:

 <snip>ns1.linode.com          A       69.93.127.10
ns2.linode.com          A       65.19.178.10
ns3.linode.com          A       75.127.96.10
ns4.linode.com          A       207.192.70.10
ns5.linode.com          A       109.74.194.10</snip> 

Does this look correct? Am I missing something in either the zone or the NSD3 config to get glue returned?

Thanks!