diff --git a/README.md b/README.md
index d69e786..6b8c1e4 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,4 @@
 
 Note:  For A star search, you should provide customized set function for the puzzel board.
        For tic tac toe game, it is machine Vs machine mode and this algorithm can only generate draw game.
+we