+.RS 4
+.TP 4
+.BR \-\-exclude=(true|false|flag)
+
+Specify whether to omit messages matching search.tag_exclude from the
+search results (the default) or not. The extra option
+.B flag
+only has an effect when
+.B --output=summary
+In this case all matching threads are returned but the "match count"
+is the number of matching non-excluded messages in the thread.
+.RE
+
+.SH EXIT STATUS
+
+This command supports the following special exit status codes
+
+.TP
+.B 20
+The requested format version is too old.
+.TP
+.B 21
+The requested format version is too new.
+