diff --git a/core/src/main/java/dev/kske/undoredo/core/Change.java b/core/src/main/java/dev/kske/undoredo/core/Change.java
index b088c7a..eaf695d 100644
--- a/core/src/main/java/dev/kske/undoredo/core/Change.java
+++ b/core/src/main/java/dev/kske/undoredo/core/Change.java
@@ -1,7 +1,7 @@
 package dev.kske.undoredo.core;
 
 /**
- * Base interface for changes to be registered in an undo manager.
+ * Base interface for changes to be registered in a change manager.
  *
  * @author Maximilian Käfer
  * @since 0.0.1
diff --git a/javafx/src/main/java/dev/kske/undoredo/javafx/ChangeManagerWrapper.java b/javafx/src/main/java/dev/kske/undoredo/javafx/ChangeManagerWrapper.java
index 0abd163..2346e84 100644
--- a/javafx/src/main/java/dev/kske/undoredo/javafx/ChangeManagerWrapper.java
+++ b/javafx/src/main/java/dev/kske/undoredo/javafx/ChangeManagerWrapper.java
@@ -28,13 +28,13 @@ public class ChangeManagerWrapper<C extends Change, M extends ChangeManager<C>>
 	public static final String	UNDO_AVAILABLE		= "undoAvailable";
 	public static final String	REDO_AVAILABLE		= "redoAvailable";
 
-	protected ReadOnlyObjectWrapper<C>	lastChange		=
+	protected final ReadOnlyObjectWrapper<C>	lastChange		=
 		new ReadOnlyObjectWrapper<>(this, LAST_CHANGE);
-	protected ReadOnlyBooleanWrapper	atMarkedChange	=
+	protected final ReadOnlyBooleanWrapper	atMarkedChange	=
 		new ReadOnlyBooleanWrapper(this, AT_MARKED_CHANGE);
-	protected ReadOnlyBooleanWrapper	undoAvailable	=
+	protected final ReadOnlyBooleanWrapper	undoAvailable	=
 		new ReadOnlyBooleanWrapper(this, UNDO_AVAILABLE);
-	protected ReadOnlyBooleanWrapper	redoAvailable	=
+	protected final ReadOnlyBooleanWrapper	redoAvailable	=
 		new ReadOnlyBooleanWrapper(this, REDO_AVAILABLE);
 
 	protected final M manager;