+.BR \-g | \-\-glueless-ok
+Do not warn about glueless referrals. Not recommended. Note that
+glueless referrals usually causes extra delays looking up names, and
+can cause lookups to fail even if in theory they could succeed. There
+is no generally agreed convention or standard for avoiding circular
+glueless situations such as
+.br
+.B example.com NS ns0.example.net.uk
+.br
+.B example.com NS ns1.example.net.uk
+.br
+.B example.net.uk NS ns0.example.com
+.br
+.B example.net.uk NS ns1.example.com
+.br
+where gluelessness would completely prevent lookups inside
+example.net.uk and example.com. The best way to be sure to avoid this
+is to avoid gluelessness.
+.TP