diff --git a/longest.py b/longest.py
index 13d1a6b..0e630e2 100644
--- a/longest.py
+++ b/longest.py
@@ -1,4 +1,4 @@
-def find_longest(arr):
+def find_longest(arr: list) -> str:
     longest = arr[1]
     for i in range(1, len(arr)):
         if len(arr[i]) > len(longest):