-of C<$CMDLINE_PARSE_DATESTAMP> to recognize datestamps and
-C<$CMDLINE_PARSE_LEVEL> to recognize levels.
+of
+
+ $CMDLINE_PARSE_DATESTAMP - recognize datestamps
+ $CMDLINE_PARSE_LEVEL - recognize levels
+ $CMDLINE_EMPTY_TO_WILDCARD - if @cmdline is empty, make a wildcard dumpspec
+
+These constants are available in export tag C<:constants>. The command-line
+format is
+
+ [host [disk [datestamp [level [host [..]]]]]]
+
+Note that there is no facility for specifying C<write_timestamp> on the command
+line.