diff --git a/functions/classes.py b/functions/classes.py
index 3b67ddc1deb6645527c6e8dae23f42f040ec21dc..014ec6e170d5c1b6e52f083d0f10516ea546658d 100644
--- a/functions/classes.py
+++ b/functions/classes.py
@@ -435,7 +435,7 @@ def print_assembly_tree(root, levels=None):
 
     Args:
         root (LegoAssembly): The root of the assembly tree to print.
-        levels (List[bool]): Internally used by recursion to know where 
+        levels (List[bool]): Internally used by recursion to know where
             to print vertical connection. Defaults to an empty list.
     """
     if not isinstance(root, LegoAssembly):