+Defines a file for input; the default input is from '\-' i.e. STDIN.
+.TP
+.B "\-k"
+"anti Kammquote":
+Tries (not too aggressively) to fix those broken zig-zag-shaped lines
+wrapped around by some MUAs which are known as "Kammquoting" in German.
+.IP
+.IR NOTE :
+This option is considered stable by now. However, sometimes Kammquotes
+should have been removed but weren't. Please send a bug report if this
+happens to you (after carefully reading the BUGS and REPORTING BUGS
+section of this man page, that is).
+.IP
+Please also note that enabling this option is quite a performance hit.
+.TP
+.BR "\-\-kminl" =n
+Minimum line length for wrapped line detection on Kammquotes. For
+details, please see the source code.
+.br
+Anyway, lower values make the algorithm more aggressive, higher values
+make Kammquotes harder to detect. Default is 65.
+.sp
+Requires
+.BR "\-k" .
+.TP
+.BR "\-\-kmaxl" =n
+Maximum line length for wrapped line detection on Kammquotes. For
+details, please see the source code.
+.br
+Anyway, higher values make the algorithm more aggressive, lower values
+make Kammquotes harder to detect. Default is 80.
+.sp
+Requires
+.BR "\-k" .
+.TP
+.BR "\-\-kdiff" =n
+Minimum length difference between two lines for wrapped line detection on
+Kammquotes. For details, please see the source code.
+.br
+Anyway, lower values make the algorithm more aggressive, higher values
+make Kammquotes harder to detect. Default is 20.
+.sp
+Requires
+.BR "\-k" .