diff --git a/src/backend/Board.java b/src/backend/Board.java
index 782f094..b6b4d58 100644
--- a/src/backend/Board.java
+++ b/src/backend/Board.java
@@ -168,18 +168,18 @@ public class Board {
                     }
                 }
 
-                if (valid) {
-                    Piece pieceToMove = board[selectedX][selectedY];
+                if (valid) {       //if the tile we have selected is a highlighted position proceed with move through the following :
+                    Piece pieceToMove = board[selectedX][selectedY];    // The previously selected X and Y coordinates contain a piece which is now the piece we want to move
 
-                    if (pieceToMove.getType() == PieceType.King && Math.abs(x - selectedX) == 2) {
+                    if (pieceToMove.getType() == PieceType.King && Math.abs(x - selectedX) == 2) {   // only case where king can move 2 tiles away is through castling so checks if it is the case.
                         y = selectedY;
-                        if (x == 6) {
-                            board[5][y] = board[7][y];
-                            board[7][y] = null;
-                            board[5][y].setMoved(true);
-                            board[5][y].setX(5);
+                        if (x == 6) {      //King side castling
+                            board[5][y] = board[7][y];   //Final position of rook becomes a rook tile
+                            board[7][y] = null;      // Initial position becomes empty
+                            board[5][y].setMoved(true);    //Manually change the moved status as the rook is not subject to it since it's technically not the piece to be moved
+                            board[5][y].setX(5);   // For same reason, in order to display correctly on the interface
                             board[5][y].setY(y);
-                        } else if (x == 2) {
+                        } else if (x == 2) {   // Queen side castling
                             board[3][y] = board[0][y];
                             board[0][y] = null;
                             board[3][y].setMoved(true);
@@ -187,9 +187,9 @@ public class Board {
                             board[3][y].setY(y);
                         }
                     }
-                    if (pieceToMove.getType() == PieceType.Pawn && (y == 0 || y == 7)) {
-                        PieceType promotionType = askPromotionChoice(pieceToMove.isWhite());
-                        board[x][y] = new Piece(x, y, promotionType, pieceToMove.isWhite());
+                    if (pieceToMove.getType() == PieceType.Pawn && (y == 0 || y == 7)) {      // When a pawn reaches an end line (no need to check color as they can only move forward so a pawn reaching 0 or 7 necessarly needs promotion)
+                        PieceType promotionType = askPromotionChoice(pieceToMove.isWhite());   // color as input to be able to replace with piece of accurate color.
+                        board[x][y] = new Piece(x, y, promotionType, pieceToMove.isWhite());   // The position of the previous pawn is replaced by the pawn defined in askPromotionChoice
                     }
 
                     // Handle en passant capture