.TP
.BR \-\-destroy\fR|\fB\-d\fR
This option indicates the split mirror will be destroyed.
+.br
+This option is mandatory on encrypted files when the encryption key is not
+available. Otherwise operation results in
+.B
+-ENOKEY.
.TP
.BR \-f\fR\ <\fInew_file\fR>
This option indicates the layout of the split mirror will be stored into
<\fInew_file\fR>.
+.br
+This option cannot be used on encrypted files when the encryption key is not
+available. It will result in
+.B
+-ENOKEY.
.SH EXAMPLES
.TP
.B lfs mirror split --mirror-id 1 /mnt/lustre/file1