-\fIlevel\fR must be one of \fBemer\fR, \fBerr\fR, \fBwarn\fR,
-\fBinfo\fR, or
-\fBdbg\fR, designating the minimum severity of a message for it to be
-logged. If it is omitted, \fIlevel\fR defaults to \fBdbg\fR.
+\fBoff\fR, \fBemer\fR, \fBerr\fR, \fBwarn\fR, \fBinfo\fR, or
+\fBdbg\fR, to control the log level. Messages of the given severity
+or higher will be logged, and messages of lower severity will be
+filtered out. \fBoff\fR filters out all messages. See
+\fBovs\-appctl\fR(8) for a definition of each log level.