diff --git a/tools/atrf-txrx/atrf-txrx.c b/tools/atrf-txrx/atrf-txrx.c
index 348984b..50504ec 100644
--- a/tools/atrf-txrx/atrf-txrx.c
+++ b/tools/atrf-txrx/atrf-txrx.c
@@ -601,7 +601,7 @@ static void usage(const char *name)
 "    repetitions number of times the message is sent (default 1)\n\n"
 "  text message mode (hard MAC):\n"
 "    -H          use hard MAC mode\n"
-"    message     message string to send (if absent, receive)\n"
+"    message     message string to send (if absent, receive)\n\n"
 "  PER test mode (transmit only):\n"
 "    -E pause_s  seconds to pause between frames (floating-point)\n"
 "    repetitions number of messages to send (default: infinite)\n\n"
@@ -611,7 +611,7 @@ static void usage(const char *name)
 "  Round-trip time measurement:\n"
 "    -R          send/receive RTT measurement packets\n"
 "    packets     number of packets to send (master)\n"
-"    size        size of packets in bytes\n"
+"    size        size of packets in bytes\n\n"
 "  constant wave test mode (transmit only):\n"
 "    -T offset   test mode. offset is the frequency offset of the constant\n"
 "                wave in MHz: -2, -0.5, or +0.5\n"