-usage = "Usage: twat --consumer_key=<key> --consumer_secret=<secret> --access_token=<key> --access_secret=<secret> [-n heartbeat] [-t to_address] [-f from_address] [-s path-to-sendmail] <username1> [username2, [username3]...]"
+usage = "Usage: twat --consumer-key=<key> --consumer-secret=<secret> --access-token=<key> --access-secret=<secret> [-n heartbeat] [-t to_address] [-f from_address] [-s path-to-sendmail] <username1> [username2, [username3]...]"