diff --git a/merkly/mtree.py b/merkly/mtree.py
index 9166227..079ad38 100644
--- a/merkly/mtree.py
+++ b/merkly/mtree.py
@@ -15,6 +15,7 @@
     validate_leafs,
 )
 
+
 class MerkleTree:
     """
     # 🌳 Merkle Tree implementation