+.TP
+.B -i
+If the nfsidmap library supports setting debug level,
+increases the verbosity of the output (can be specified multiple times).
+.TP
+.B -p
+Use \fIprincipal\fR instead of the default
+.RI nfs/ FQDN @ REALM .
+.TP
+.B -n
+Use the system default credentials
+.RI (host/ FQDN @ REALM )
+rather than the default
+.RI nfs/ FQDN @ REALM .