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diff --git a/lib/vlog-unixctl.man b/lib/vlog-unixctl.man
index 86eece3b7..1890dc2fc 100644
--- a/lib/vlog-unixctl.man
+++ b/lib/vlog-unixctl.man
@@ -1,28 +1,48 @@
+.de IQ
+.  br
+.  ns
+.  IP "\\$1"
+..
 .SS "VLOG COMMANDS"
 These commands manage \fB\*(PN\fR's logging settings.
-.IP "\fBvlog/set\fR \fImodule\fR[\fB:\fIfacility\fR[\fB:\fIlevel\fR]]"
-Sets the logging level for \fImodule\fR in \fIfacility\fR to
-\fIlevel\fR:
+.IP "\fBvlog/set\fR [\fIspec\fR]"
+Sets logging levels.  Without any \fIspec\fR, sets the log level for
+every module and facility to \fBdbg\fR.  Otherwise, \fIspec\fR is a
+list of words separated by spaces or commas or colons, up to one from
+each category below:
 .
 .RS
 .IP \(bu
-\fImodule\fR may be any valid module name (as displayed by the
-\fB--list\fR action on \fBovs\-appctl\fR(8)), or the special name
-\fBANY\fR to set the logging levels for all modules.
+A valid module name, as displayed by the \fBvlog/list\fR command on
+\fBovs\-appctl\fR(8), limits the log level change to the specified
+module.
 .
 .IP \(bu
-\fIfacility\fR may be \fBsyslog\fR, \fBconsole\fR, or \fBfile\fR to
-set the levels for logging to the system log, the console, or a file
-respectively, or \fBANY\fR to set the logging levels for both
-facilities.  If it is omitted, \fIfacility\fR defaults to \fBANY\fR.
+\fBsyslog\fR, \fBconsole\fR, or \fBfile\fR, to limit the log level
+change to only to the system log, to the console, or to a file,
+respectively.
 .IP
-The log level for the \fBfile\fR facility has no effect unless
-\fB\*(PN\fR was invoked with the \fB--log-file\fR option.
+On Windows platform, \fBsyslog\fR is accepted as a word and is only
+useful along with the \fB\-\-syslog\-target\fR option (the word has no
+effect otherwise).
+.
 .IP \(bu 
-\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.
+.RE
+.
+.IP
+Case is not significant within \fIspec\fR.
+.IP
+Regardless of the log levels set for \fBfile\fR, logging to a file
+will not take place unless \fB\*(PN\fR was invoked with the
+\fB\-\-log\-file\fR option.
+.IP
+For compatibility with older versions of OVS, \fBany\fR is accepted as
+a word but has no effect.
 .RE
 .IP "\fBvlog/set PATTERN:\fIfacility\fB:\fIpattern\fR"
 Sets the log pattern for \fIfacility\fR to \fIpattern\fR.  Refer to
@@ -36,4 +56,21 @@ Causes \fB\*(PN\fR to close and reopen its log file.  (This is useful
 after rotating log files, to cause a new log file to be used.)
 .IP
 This has no effect unless \fB\*(PN\fR was invoked with the
-\fB--log-file\fR option.
+\fB\-\-log\-file\fR option.
+.
+.IP "\fBvlog/disable\-rate\-limit \fR[\fImodule\fR]..."
+.IQ "\fBvlog/enable\-rate\-limit \fR[\fImodule\fR]..."
+By default, \fB\*(PN\fR limits the rate at which certain messages can
+be logged.  When a message would appear more frequently than the
+limit, it is suppressed.  This saves disk space, makes logs easier to
+read, and speeds up execution, but occasionally troubleshooting
+requires more detail.  Therefore, \fBvlog/disable\-rate\-limit\fR
+allows rate limits to be disabled at the level of an individual log
+module.  Specify one or more module names, as displayed by the
+\fBvlog/list\fR command.  Specifying either no module names at all or
+the keyword \fBany\fR disables rate limits for every log module.
+.
+.IP
+The \fBvlog/enable\-rate\-limit\fR command, whose syntax is the same
+as \fBvlog/disable\-rate\-limit\fR, can be used to re-enable a rate
+limit that was previously disabled.