--- doc/ftp.proxy.1.orig	2023-02-20 12:32:45 UTC
+++ doc/ftp.proxy.1
@@ -373,6 +373,10 @@ tell \fIftp.proxy\fR to use \fIport\fR as source port 
 transfers (using port number 20 is FTP standard).
 Keep in mind that port numbers below 1024 require root permissions.
 .TP
+\fB-P\fR \fIfilename\fR
+tell \fIftp.proxy\fR to write the PID of the master process into
+the \fIfilename\fR specified.
+.TP
 \fB-q\fR \fIsourceip\fR
 sets the IP number for the outgoing control connection.
 .TP
