diff --git a/drivers/py/driver.py b/drivers/py/driver.py
index 3567a0362..b199d6658 100755
--- a/drivers/py/driver.py
+++ b/drivers/py/driver.py
@@ -201,8 +201,8 @@ def run_driver(
         "--mode",
         type=str,
         default="dummy",
+        choices=list(__drivers__.keys()),
         help="""Type of potential to be used to compute the potential and its derivatives.
-                Currently implemented: [dummy, harmonic]
         """,
     )
     parser.add_argument(