diff --git a/src/akkudoktoreos/class_optimize.py b/src/akkudoktoreos/class_optimize.py
index c6748ba..6c46d98 100644
--- a/src/akkudoktoreos/class_optimize.py
+++ b/src/akkudoktoreos/class_optimize.py
@@ -11,6 +11,7 @@ from akkudoktoreos.class_inverter import Wechselrichter
 from akkudoktoreos.config import moegliche_ladestroeme_in_prozent
 from akkudoktoreos.visualize import visualisiere_ergebnisse
 
+
 class optimization_problem:
     def __init__(
         self,