diff --git a/owlps-aggregator/owlps-aggregatord.c b/owlps-aggregator/owlps-aggregatord.c
index a1c4819..7c64788 100644
--- a/owlps-aggregator/owlps-aggregatord.c
+++ b/owlps-aggregator/owlps-aggregatord.c
@@ -1537,8 +1537,9 @@ void print_usage()
          "\n\t"
          " [-c check_interval]"
          " [-A]"
-         " [-a autocalibration_port]"
+         " [-O autocalibration_order_port]"
          "\n\t"
+         " [-H hello_port]"
          " [-K cp_keep_timeout]"
          " [-C ac_order_interval]"
          "\n"
@@ -1567,15 +1568,15 @@ void print_usage()
          " output).\n"
          "\t-F\t\t\tDo not flush the output file after each analyse"
          "\n\t\t\t\tof the requests' list.\n"
-         "\t-i positionner_ip\tIP address of the localisation server"
+         "\t-i positionner_ip\tIP address of the positioning server"
          " (default:\n\t\t\t\t%s).\n"
          "\t-p positioner_port\tAggregated requests are transmitted to"
-         " the\n\t\t\t\tlocalisation server on this port (default:"
+         " the\n\t\t\t\tpositioning server on this port (default:"
          "\n\t\t\t\t%d).\n"
 
          "Aggregation options:\n"
-         "\t-l listening_port\tOnly requests sent on this port will be"
-         " treated\n\t\t\t\t(default: %d).\n"
+         "\t-l listening_port\tListen for requests from the capture"
+         " points on\n\t\t\t\tthis port (default: %d).\n"
          "\t-t aggregate_timeout\tRequests are stored during"
          " 'aggregate_timeout'\n\t\t\t\tmilliseconds before to be"
          " grouped (default:\n\t\t\t\t%d ms).\n"
@@ -1586,10 +1587,11 @@ void print_usage()
 
          "Autocalibration options:\n"
          "\t-A\t\t\tEnable autocalibration (default: disabled).\n"
-         "\t-O port\t\t\tPort on which autocalibration orders are"
-         " sent to\n\t\t\t\tthe listeners (default: %d).\n"
-         "\t-H port\t\t\tPort on which autocalibration hello are"
-         " received\n\t\t\t\tfrom the listeners (default: %d).\n"
+         "\t-O ac_order_port\tPort on which autocalibration orders"
+         " are sent to\n\t\t\t\tthe listeners (default: %d).\n"
+         "\t-H hello_port\t\tPort on which autocalibration hello"
+         " messages are\n\t\t\t\treceived from the listeners"
+         " (default: %d).\n"
          "\t-K cp_keep_timeout\tInactive CPs are kept during"
          " 'cp_keep_timeout'\n\t\t\t\tseconds (default: %d s).\n"
          "\t-C ac_order_interval\tTime (in milliseconds) between two"