diff --git a/book_maker/loader/helper.py b/book_maker/loader/helper.py
index b473b21..ba5485e 100644
--- a/book_maker/loader/helper.py
+++ b/book_maker/loader/helper.py
@@ -37,7 +37,7 @@ class EPUBBookLoaderHelper:
         Exception,
         on_backoff=lambda details: logger.warning(f"retry backoff: {details}"),
         on_giveup=lambda details: logger.warning(f"retry abort: {details}"),
-        jitter=None
+        jitter=None,
     )
     def translate_with_backoff(self, text, context_flag=False):
         return self.translate_model.translate(text, context_flag)
@@ -129,4 +129,4 @@ def not_trans(s):
             is_text_digit_and_space(s),
             is_text_isbn(s),
         ]
-    )
\ No newline at end of file
+    )