diff --git a/sequence_extractor/poly_a.py b/sequence_extractor/poly_a.py
index c1d8d9476d6ca0dee36155cc20342b697c165c68..73913713a0298e4a292120f7afc7bab41039bddd 100644
--- a/sequence_extractor/poly_a.py
+++ b/sequence_extractor/poly_a.py
@@ -5,6 +5,7 @@ import numpy as np
 
 # To do: Taking probabilities of nucleotides from user and raising error if sum != 1
 
+
 def poly_a_generator(
     exon: str,
 ) -> str: