diff --git a/math/check_sudoku_board.py b/math/check_sudoku_board.py
index 1751ddd..9b195d4 100644
--- a/math/check_sudoku_board.py
+++ b/math/check_sudoku_board.py
@@ -51,3 +51,4 @@ def is_valid_sudoku(board) -> bool:
       boxes[index].add(val)
         
   return True
+