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diff --git a/src/org/jivesoftware/smack/PacketListener.java b/src/org/jivesoftware/smack/PacketListener.java
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+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright 2003-2007 Jive Software.
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smack;
+
+import org.jivesoftware.smack.packet.Packet;
+
+/**
+ * Provides a mechanism to listen for packets that pass a specified filter.
+ * This allows event-style programming -- every time a new packet is found,
+ * the {@link #processPacket(Packet)} method will be called. This is the
+ * opposite approach to the functionality provided by a {@link PacketCollector}
+ * which lets you block while waiting for results.
+ *
+ * @see Connection#addPacketListener(PacketListener, org.jivesoftware.smack.filter.PacketFilter)
+ * @author Matt Tucker
+ */
+public interface PacketListener {
+
+    /**
+     * Process the next packet sent to this packet listener.<p>
+     *
+     * A single thread is responsible for invoking all listeners, so
+     * it's very important that implementations of this method not block
+     * for any extended period of time.
+     *
+     * @param packet the packet to process.
+     */
+    public void processPacket(Packet packet);
+
+}