diff --git a/infrastructure-centred/owlps-client/owlps-client.c b/infrastructure-centred/owlps-client/owlps-client.c
index 3c9ce5b..0ce8dd0 100644
--- a/infrastructure-centred/owlps-client/owlps-client.c
+++ b/infrastructure-centred/owlps-client/owlps-client.c
@@ -422,8 +422,11 @@ void print_usage()
          "\t-d dest_ip\tDestination IP address of the localisation request.\n"
          "\t-p dest_port\tDestination port of the localisation request"
          " (default: %d).\n"
-         "\t-t delay\tTime between each packet transmission.\n"
-         "\t-n nb_packets\tNumber of packet transmitted for the request.\n"
+         "\t-t delay\tTime between each packet transmission (default: %d"
+         " µs for a normal request, %d µs for a calibration request).\n"
+         "\t-n nb_packets\tNumber of packet transmitted for the request"
+         " (default: %d for a normal request, %d for a calibration"
+         " request).\n"
          "\t-i iface\tName of the network interface used to transmit the"
          " request (e.g. \"eth2\"). If this option is absent, interface"
          " is selected automatically. You must be root to use this"
@@ -435,6 +438,10 @@ void print_usage()
          program_name,
          program_name,
          LOC_REQUEST_DEFAULT_PORT,
+         DEFAULT_DELAY_NORMAL,
+         DEFAULT_DELAY_CALIB,
+         DEFAULT_NBPKT_NORMAL,
+         DEFAULT_NBPKT_CALIB,
          MOBILE_DEFAULT_PORT
          ) ;
 }