diff --git a/sniffer/tools/sniffer.py b/sniffer/tools/sniffer.py
index 20a7fd280b..36110fb9f7 100755
--- a/sniffer/tools/sniffer.py
+++ b/sniffer/tools/sniffer.py
@@ -143,14 +143,14 @@ def main():
     p = argparse.ArgumentParser()
     p.add_argument("-b", "--baudrate", type=int, default=115200,
                    help="Baudrate of the serial port (only evaluated "
-                        "for non TCP-terminal)")
+                        "for non TCP-terminal, default: 112500)")
     p.add_argument("conn", metavar="tty/host:port", type=str,
                    help="Serial port or TCP (host, port) tuple to "
                         "terminal with sniffer application")
     p.add_argument("channel", type=int, help="Channel to sniff on")
     p.add_argument("outfile", type=argparse.FileType("w+b"),
                    default=default_outfile, nargs="?",
-                   help="PCAP file to output to")
+                   help="PCAP file to output to (default: stdout)")
     args = p.parse_args()
 
     conn = connect(args)