diff --git a/keras_contrib/optimizers/ftml.py b/keras_contrib/optimizers/ftml.py
index 367e6a2..4030714 100644
--- a/keras_contrib/optimizers/ftml.py
+++ b/keras_contrib/optimizers/ftml.py
@@ -3,6 +3,7 @@ from keras.optimizers import Optimizer
 from .. import backend as K
 from keras.utils.generic_utils import get_custom_objects
 
+
 class FTML(Optimizer):
     """FTML optimizer.