diff --git a/src/missense_kinase_toolkit/pfam.py b/src/missense_kinase_toolkit/pfam.py
index f57ffcd..e38bc64 100644
--- a/src/missense_kinase_toolkit/pfam.py
+++ b/src/missense_kinase_toolkit/pfam.py
@@ -129,7 +129,7 @@ def extract_numeric(
     ----------
     input_string : str
         Input string
-    
+
     Returns
     -------
     str