diff --git a/pygsm/text.py b/pygsm/text.py
index bbe33f4..b6236fb 100755
--- a/pygsm/text.py
+++ b/pygsm/text.py
@@ -23,9 +23,12 @@ parser_read = subparsers.add_parser('read', help='read text messages')
 parser_read.add_argument('-i', '--interface', help='serial interface', metavar='TTY', required=True)
 parser_read.add_argument('-n', '--number', help='sms inbox number', metavar='SMS')
 
-parser_read = subparsers.add_parser('one', help='read first sms inbox messages')
+parser_one = subparsers.add_parser('one', help='read first sms inbox messages')
+parser_one.add_argument('-i', '--interface', help='serial interface', metavar='TTY', required=True)
+
+parser_del = subparsers.add_parser('del', help='del first sms inbox messages')
+parser_del.add_argument('-i', '--interface', help='serial interface', metavar='TTY', required=True)
 
-parser_read = subparsers.add_parser('del', help='del first sms inbox messages')
 
 args = parser.parse_args()