diff --git a/dspawn/cli.py b/dspawn/cli.py
index d9b2f05..99a98c2 100755
--- a/dspawn/cli.py
+++ b/dspawn/cli.py
@@ -23,7 +23,7 @@ def main():
                         nargs='*',
                         help='container name(s)')
     parser.add_argument('-r', '--release',
-                        choices=['stable', 'jessie', 'stretch', 'buster'],
+                        choices=['stable', 'jessie', 'stretch', 'buster', 'bullseye'],
                         default='stable',
                         help='which release model shall we use;'
                         'dafault: stable')