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diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/prioritystack/IPriorityStackListener.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/prioritystack/IPriorityStackListener.java
new file mode 100644
index 000000000..4239e4552
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+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/prioritystack/IPriorityStackListener.java
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * 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.prioritystack;
+
+public interface IPriorityStackListener<E> {
+
+	/**
+	 * T has been added to the context
+	 * @param sender context
+	 * @param item
+	 */
+	void itemAdded(IPriorityStack<E> sender, E item);
+	
+	/**
+	 * T has been removed from the stack
+	 * @param sender context
+	 * @param item
+	 */
+	void itemRemoved(IPriorityStack<E> sender, E item);
+
+}