diff --git a/OOP_3B5_Project/src/backend/Move.java b/OOP_3B5_Project/src/backend/Move.java
index af989ff..875eed4 100644
--- a/OOP_3B5_Project/src/backend/Move.java
+++ b/OOP_3B5_Project/src/backend/Move.java
@@ -367,7 +367,7 @@ public boolean isKingMoveValid(int x, int y, boolean color,  int selectX, int se
         if (selectX == x + 1 && selectY == y) {	
 			return checkColor(x, y, color);
         }
-        if (color == true) {
+        if (color == true) { // for white king 
         	if ((selectX == x - 3 && selectY == y)) {
         		return specialMoves.shortCastle(myPiece);