diff --git a/src/backend/Piece.java b/src/backend/Piece.java
index 5e45e49..2b070d7 100644
--- a/src/backend/Piece.java
+++ b/src/backend/Piece.java
@@ -7,7 +7,7 @@ public class Piece {
 	private int y;
 	private boolean pieceColor;
 	private PieceType type;
-	private boolean hasMoved = false;
+	private boolean hasMoved = false;   // useful for castling
 	
 	public boolean getHasMoved() {
 		return hasMoved;
@@ -17,7 +17,7 @@ public class Piece {
 		this.hasMoved = moved; 
 	}
 	
-	public Piece(int x,int y, PieceType type,boolean pieceColor) {
+	public Piece(int x,int y, PieceType type,boolean pieceColor) { //Piece constructor with all attributes
 		this.x = x;
 		this.y = y;
 		this.pieceColor = pieceColor;
@@ -49,12 +49,12 @@ public class Piece {
 		return pieceColor;
 	}
 	
-	public ArrayList<int[]> getValidMoves(Board board) {
-        ArrayList<int[]> moves = new ArrayList<>();
+	public ArrayList<int[]> getValidMoves(Board board) {  //List all valid moves to highlight them and enable play
+        ArrayList<int[]> moves = new ArrayList<>(); 
         int x = this.getX();
         int y = this.getY();
 
-        switch (type) {
+        switch (type) {   //Switch just for simplicity but could be replaced by ifs.
             case Pawn:
                 int direction = isWhite() ? -1 : 1;
                 int nextY = y + direction;
@@ -149,7 +149,7 @@ public class Piece {
 
             case Knight:
                 int[][] jumps = {
-                    {1, 2}, {2, 1}, {-1, 2}, {-2, 1},
+                    {1, 2}, {2, 1}, {-1, 2}, {-2, 1},  // L moves
                     {-1, -2}, {-2, -1}, {1, -2}, {2, -1}
                 };
                 for (int[] j : jumps) {
@@ -171,9 +171,9 @@ public class Piece {
 	
 	private boolean canCastle(Board board, int kingX, int y, int rookX) {
 		if (rookX == 7) {        // identify if castle on king-side
-			if (board.getPiece(rookX, y)  != null && board.getPiece(rookX, y).getType() == PieceType.Rook && !board.getPiece(rookX, y).getHasMoved()) {
-				if (board.getPiece(5, y) == null && board.getPiece(6, y) == null) {
-					return true;
+			if (board.getPiece(rookX, y)  != null && board.getPiece(rookX, y).getType() == PieceType.Rook && !board.getPiece(rookX, y).getHasMoved()) {  // Checks all necessary conditions for castling on rook
+				if (board.getPiece(5, y) == null && board.getPiece(6, y) == null) { // check if nothing between king and rook
+					return true;  // include castle in valid moves
 				}
 				else {
 					return false;