diff --git a/check_systemd_timer.py b/check_systemd_timer.py
old mode 100644
new mode 100755
index 3937e3b..5992ee8
--- a/check_systemd_timer.py
+++ b/check_systemd_timer.py
@@ -45,7 +45,7 @@ def check_timer(timer_name):
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
-    parser.add_argument('-t', '--timer', required=True, help='The name of the timer to check')
+    parser.add_argument('-t', '--timer', required=True, help='The name of the timer to check.')
     args = parser.parse_args()
 
     try: