diff --git a/math/check_sudoku_board.py b/math/check_sudoku_board.py
index d162cc2..1751ddd 100644
--- a/math/check_sudoku_board.py
+++ b/math/check_sudoku_board.py
@@ -3,7 +3,7 @@
 # author: bt3gl
 
 
-```
+'''
 Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:
 
 - Each row must contain the digits 1-9 without repetition.
@@ -21,7 +21,7 @@ Input: board =
 ,[".",".",".","4","1","9",".",".","5"]
 ,[".",".",".",".","8",".",".","7","9"]]
 Output: true
-```
+'''
 
 def is_valid_sudoku(board) -> bool: