diff --git a/trees/has_path_sum.py b/trees/bt_has_path_sum.py
similarity index 90%
rename from trees/has_path_sum.py
rename to trees/bt_has_path_sum.py
index 42454ee..9590c17 100644
--- a/trees/has_path_sum.py
+++ b/trees/bt_has_path_sum.py
@@ -2,7 +2,7 @@
 # -*- coding: utf-8 -*-
 # author: bt3gl
 
-def has_path_sum(root: Optional[TreeNode], target_sum: int) -> bool:
+def has_path_sum(root: Optional[Node], target_sum: int) -> bool:
     
         def transverse(node, sum_here=0):