diff --git a/phc2sys.8 b/phc2sys.8
index 4fc4fa3..d66284b 100644
--- a/phc2sys.8
+++ b/phc2sys.8
@@ -20,6 +20,8 @@ phc2sys \- synchronize two or more clocks
] [
.BI \-O " offset"
] [
+.BI \-T " transport-specific-field"
+] [
.BI \-w
] [ options ]
@@ -225,6 +227,11 @@ Display a help message.
.TP
.B \-v
Prints the software version and exits.
+.TP
+.BI \-T " transport-specific-field"
+Specify the transport specific field in sent messages as a hexadecimal
number.
+The default is 0x0.
+
.SH TIME SCALE USAGE
diff --git a/phc2sys.c b/phc2sys.c
index 0ec1ea7..0efc89d 100644
--- a/phc2sys.c
+++ b/phc2sys.c
@@ -1304,6 +1304,7 @@ static void usage(char *progname)
" -z [path] server address for UDS (/var/run/ptp4l)\n"
" -l [num] set the logging level to 'num' (6)\n"
" -t [tag] add tag to log messages\n"
+ " -T [0/1] set transport specific value to 'num'
(0)\n"
" -m print messages to stdout\n"
" -q do not print messages to the syslog\n"
" -v prints the software version and exits\n"
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