diff --git a/app/vocabulary.py b/app/vocabulary.py
index 2098d1c..73864d7 100644
--- a/app/vocabulary.py
+++ b/app/vocabulary.py
@@ -58,4 +58,4 @@ class ArticleVocabularyLevel(VocabularyLevelEstimator):
     def level(self):
         if not self.top_levels:
             return 0
-        return sum(self.top_levels) / len(self.top_levels)
\ No newline at end of file
+        return sum(self.top_levels) / len(self.top_levels)