+.B "ZFS_HOSTID=id"
+Use \fBid\fR instead of the SPL hostid to identify this host. Intended for use
+with ztest, but this environment variable will affect any utility which uses
+libzpool, including \fBzpool(8)\fR. Since the kernel is unaware of this setting
+results with utilities other than ztest are undefined.
+.TP