diff --git a/src/break_out/model/Ball.java b/src/break_out/model/Ball.java
index 4758721..845d24e 100644
--- a/src/break_out/model/Ball.java
+++ b/src/break_out/model/Ball.java
@@ -6,6 +6,7 @@ import break_out.Constants;
  * This class contains the information about the balls characteristics and behavior
  * 
  * @author iSchumacher
+ * @author modified by 175
  *
  */
 public class Ball implements IBall{
@@ -51,31 +52,30 @@ public class Ball implements IBall{
 	}
 	
 	/**
-	 * 
+	 * updates ball position
 	 */
 	public void updatePosition() {
-	    // @rxbn, Ruben Meyer
+		// sets X position
         this.position.setX(this.position.getX()+this.direction.getDx());
+
+        // sets Y position
         this.position.setY(this.position.getY()+this.direction.getDy());
 	}
 	
 	/**
-	 * 
+	 * Ball reacts to contact with the borders
 	 */
 	public void reactOnBorder() {
-
-	    // @rxbn, Ruben Meyer
-
-        // left border
+        // reacts on left border
         if(this.position.getX() < 0) this.direction.setDx(-(this.direction.getDx()));
 
-	    // right border
+	    // reacts on right border (+Diameter because of hitbox)
 		if(this.position.getX()+Constants.BALL_DIAMETER > Constants.SCREEN_WIDTH) this.direction.setDx(-(this.direction.getDx()));
 
-        // top border
+        // reacts on top border
         if(this.position.getY() < 0) this.direction.setDy(-(this.direction.getDy()));
 
-        // bottom border
+        // reacts on bottom border (+Diameter because of hitbox)
         if(this.position.getY()+Constants.BALL_DIAMETER > Constants.SCREEN_HEIGHT) this.direction.setDy(-(this.direction.getDy()));
 	}
 	
diff --git a/src/break_out/model/Level.java b/src/break_out/model/Level.java
index a8653f5..3f7d3a2 100644
--- a/src/break_out/model/Level.java
+++ b/src/break_out/model/Level.java
@@ -6,6 +6,7 @@ package break_out.model;
  * 
  * @author dmlux
  * @author I. Schumacher
+ * @author modified by 175
  */
 public class Level extends Thread {
 
diff --git a/src/break_out/model/Vector2D.java b/src/break_out/model/Vector2D.java
index 4dbaa9a..3900792 100644
--- a/src/break_out/model/Vector2D.java
+++ b/src/break_out/model/Vector2D.java
@@ -7,6 +7,7 @@ import break_out.model.Position;
  * This class represent a two dimensional vector.
  * 
  * @author I. Schumacher
+ * @author modified by 175
  */
 public class Vector2D implements IVector2D {
 
@@ -67,11 +68,11 @@ public class Vector2D implements IVector2D {
 		this.dy = dy;
 	}
 
-	/*
+	/**
 	 * Rescale part
 	 */
 	public void rescale() {
-		// calc unit vector
+		// calc unit vector and set it
 		double vectorlength = Math.sqrt(Math.pow(getDx(), 2) + Math.pow(getDy(), 2));
 		setDx((1/vectorlength) * getDx() * Constants.BALL_SPEED);
 		setDy((1/vectorlength) * getDy() * Constants.BALL_SPEED);
diff --git a/src/break_out/view/Field.java b/src/break_out/view/Field.java
index c5c63ba..8dc9104 100644
--- a/src/break_out/view/Field.java
+++ b/src/break_out/view/Field.java
@@ -15,7 +15,7 @@ import net.miginfocom.swing.MigLayout;
  * The field represents the board of the game. All components are on the board
  * 
  * @author dmlux, modified by iSchumacher
- * 
+ * @author modified by 175
  */
 public class Field extends JPanel {
 
diff --git a/src/break_out/view/View.java b/src/break_out/view/View.java
index 8b1de7b..f517b4a 100644
--- a/src/break_out/view/View.java
+++ b/src/break_out/view/View.java
@@ -12,6 +12,7 @@ import break_out.model.Game;
  * gets the components from the game which is connected to this class
  * 
  * @author dmlux
+ * @author modified by 175
  * 
  */
 public class View extends JFrame  {
@@ -71,7 +72,7 @@ public class View extends JFrame  {
 		setVisible(true);
 		pack();
 
-		// hotfix: screen size
+		// hotfix: zero-sized window size on linux
 		setMinimumSize(new Dimension(1, 1));
 	}