diff --git a/src/edu/kit/informatik/model/Track.java b/src/edu/kit/informatik/model/Track.java
index ff6c259..484181f 100644
--- a/src/edu/kit/informatik/model/Track.java
+++ b/src/edu/kit/informatik/model/Track.java
@@ -5,7 +5,7 @@ import edu.kit.informatik.ui.InvalidInputException;
 import java.util.Objects;
 
 /**
- * A straight track.
+ * A straight track. An object of this class is immutable.
  *
  * @author Arne Keller
  * @version 1.0