--- a/rollbot.py	Wed May 11 00:06:30 2016 +0800
+++ b/rollbot.py	Wed May 11 00:09:34 2016 +0800
@@ -93,7 +93,7 @@
     group = parser.add_argument_group('main configuration', 'options that can be specified in the configuration file')
     group.add_argument('-j', '--jid', help='JID to use')
     group.add_argument('-p', '--password', help='password to use')
-    group.add_argument('-n', '--nick', help='MUC nickname')
+    group.add_argument('-n', '--nick', help='MUC nickname (default: rollbot)')
     group.add_argument('--prefix', help='command prefix (default: !)')
 
     group = parser.add_mutually_exclusive_group()