diff --git a/tests/display_setting_txt.py b/tests/display_setting_txt.py
index a6d3a3a..ad2bcf4 100644
--- a/tests/display_setting_txt.py
+++ b/tests/display_setting_txt.py
@@ -3,6 +3,9 @@
 import sys, Wii
 
 def main():
+	if len(sys.argv) == 1:
+		print "python display_setting_txt.py <setting.txt>"
+		exit(1)
 	settings = Wii.CONF(sys.argv[1])
 	print settings.getKeysName()
 	for x in settings.getKeysName():