diff --git a/rxn_rebuild/rxn_rebuild.py b/rxn_rebuild/rxn_rebuild.py
index 040c88b..bb3ebef 100644
--- a/rxn_rebuild/rxn_rebuild.py
+++ b/rxn_rebuild/rxn_rebuild.py
@@ -15,6 +15,7 @@
 
 SIDES = ['left', 'right']
 
+
 def rebuild_rxn(
     rxn_rule_id: str,
     transfo: str,