.B * prefer\fR - component preferred for read/write in a mirrored file
.RE
.RS
-.B * stale\fR - component has outdated data in a mirrored file. Once a
-component is marked
+.B * stale\fR - component has outdated data in a mirrored file. This flag is
+not allowed to be set on a component of the last non-stale mirror.
+Once a component is marked
.BR stale ,
it isn't permitted to clear this flag directly. \fBlfs-mirror-resync\fR(1)
is required to clear the flag.