nsupdate to delete NS entry

[BIJU KURIAN]

How can i delete the following entry from test.com.db using nsupdate--

test.com.         3600    IN      NS      host1.test.com.




I usually manage test.com using nsupdate..

for eg: nsupdate..> update add host2.test.com 86400 A 10.1.1.1


-BMK