diff --git a/source/wifi.src b/source/wifi.src
index 4a46827..fd3620e 100644
--- a/source/wifi.src
+++ b/source/wifi.src
@@ -1,10 +1,18 @@
+if params.len < 1 or params[0] == "-h" or params[0] == "--help" then
+	current_program = get_shell.host_computer.File(program_path)
+	print("Usage: " + current_program.name + " [-l|-a|<ESSID>|<BSSID>]")
+	print("  -l                 list nearby networks")
+	print("  -a                 crack and connect to all networks")
+	print("  MyNetwork          crack and connect by ESSID")
+	print("  AA:BB:CC:DD:EE:FF  crack and connect by BSSID")
+	exit
+end if
 crypto = include_lib("/lib/crypto.so")
 computer = get_shell.host_computer
 cappath = current_path + "/file.cap"
 info = "BSSID STRENGTH ESSID"
 netname = ""
-command = ""
-if params.len > 0 then command = params[0]
+command = params[0]
 for letter in computer.network_devices
 	if letter == " " then
 		break
@@ -19,7 +27,7 @@ for net in nets
 	if command == "-l" then
 		info = info + "\n" + net
 		continue
-	else if command == essid or command == bssid or command == "" then
+	else if command == essid or command == bssid or command == "-a" then
 		crypto.airmon("start", netname)
 		crypto.aireplay(bssid, essid, floor(300000 / strength))
 		pwd = crypto.aircrack(cappath)