diff --git a/doc/man1/rigctld.1 b/doc/man1/rigctld.1
index b8bd84949..2a8847ec2 100644
--- a/doc/man1/rigctld.1
+++ b/doc/man1/rigctld.1
@@ -25,6 +25,7 @@ rigctld \- TCP radio control daemon
 .OP \-D type
 .OP \-s baud
 .OP \-c id
+.OP \-S char
 .OP \-T IPADDR
 .OP \-t number
 .OP \-C parm=val