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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/IHintListener.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/IHintListener.java
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index 000000000..d73f7eb6a
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+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/hints/IHintListener.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+/*
+ *
+ * @author Toni Kalajainen
+ */
+package org.simantics.utils.datastructures.hints;
+
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+
+public interface IHintListener {
+
+	/**
+	 * Value has changed or new value has spawned
+	 * 
+	 * @param sender the stack 
+	 * @param key the key 
+	 * @param oldValue the old value. If this value is null, a new hint has been added
+	 * @param newValue the new value. This value is never null
+	 */
+	void hintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue);
+	
+	/**
+	 * 
+	 * @param sender the stack 
+	 * @param key the key 
+	 * @param oldValue the old value
+	 */
+	void hintRemoved(IHintObservable sender, Key key, Object oldValue);
+	
+}