diff --git a/src/fsrs_optimizer/fsrs_optimizer.py b/src/fsrs_optimizer/fsrs_optimizer.py
index 25d6e20..50d8ee8 100644
--- a/src/fsrs_optimizer/fsrs_optimizer.py
+++ b/src/fsrs_optimizer/fsrs_optimizer.py
@@ -519,7 +519,6 @@ def loss(stability):
 class Optimizer:
     float_delta_t: bool = False
     enable_short_term: bool = True
-    
 
     def __init__(
         self, float_delta_t: bool = False, enable_short_term: bool = True