diff --git a/check_mysql_slave/__init__.py b/check_mysql_slave/__init__.py
index 920926a7a669a8ed677bd53c1cb37e20fb893f91..423d0c8f3cda1e5da9023083abc528fc8d4d53c7 100644
--- a/check_mysql_slave/__init__.py
+++ b/check_mysql_slave/__init__.py
@@ -27,7 +27,7 @@ def getSlaveStatus(host, user, passwd, port):
 
 
 def main():
-    parser = ArgumentParser()
+    parser = ArgumentParser(description='Check MySQL seconds behind master for Nagios-like monitoring.')
     parser.add_argument('-u',
                         '--user',
                         help='Login username',