diff --git a/toota-palooza/cli.py b/toota-palooza/cli.py
index 1fc5bc8..04b8147 100644
--- a/toota-palooza/cli.py
+++ b/toota-palooza/cli.py
@@ -110,14 +110,16 @@ def once(tooter: Tooter):
 
 def main():
     parser = argparse.ArgumentParser(
-        description='Check for suspicious impersonators.')
+        description='Randomly interact with a Mastodon timeline.')
     parser.add_argument( '-d', '--debug', action='store_true',
         help='Enable debugging messages.')
     parser.add_argument( '-o', '--once', action='store_true',
         help='Run once and exit. Default is to run as a daemon.')
+    parser.add_argument( 'file', nargs='?', default='users.toml',
+        help='Change file to source users from.')
     args = parser.parse_args()
 
-    Tooter.load_credentials('users.toml')
+    Tooter.load_credentials(args.file)
 
     if args.once:
         t = Tooter('nick')