.B -r
If the rpcsec_gss library supports setting debug level,
increases the verbosity of the output (can be specified multiple times).
+.TP
+.B -R realm
+Kerberos tickets from this
+.I realm
+will be preferred when scanning available credentials cache files to be
+used to create a context. By default, the default realm, as configured
+in the Kerberos configuration file, is preferred.
+.TP
+.B -t timeout
+Timeout, in seconds, for kernel gss contexts. This option allows you to force
+new kernel contexts to be negotiated after
+.I timeout
+seconds, which allows changing Kerberos tickets and identities frequently.
+The default is no explicit timeout, which means the kernel context will live
+the lifetime of the Kerberos service ticket used in its creation.
.SH SEE ALSO
.BR rpc.svcgssd(8)
.SH AUTHORS