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diff --git a/src/org/jivesoftware/smack/filter/PacketFilter.java b/src/org/jivesoftware/smack/filter/PacketFilter.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.filter;
+
+import org.jivesoftware.smack.packet.Packet;
+
+/**
+ * Defines a way to filter packets for particular attributes. Packet filters are
+ * used when constructing packet listeners or collectors -- the filter defines
+ * what packets match the criteria of the collector or listener for further
+ * packet processing.<p>
+ *
+ * Several pre-defined filters are defined. These filters can be logically combined
+ * for more complex packet filtering by using the
+ * {@link org.jivesoftware.smack.filter.AndFilter AndFilter} and
+ * {@link org.jivesoftware.smack.filter.OrFilter OrFilter} filters. It's also possible
+ * to define your own filters by implementing this interface. The code example below
+ * creates a trivial filter for packets with a specific ID.
+ *
+ * <pre>
+ * // Use an anonymous inner class to define a packet filter that returns
+ * // all packets that have a packet ID of "RS145".
+ * PacketFilter myFilter = new PacketFilter() {
+ *     public boolean accept(Packet packet) {
+ *         return "RS145".equals(packet.getPacketID());
+ *     }
+ * };
+ * // Create a new packet collector using the filter we created.
+ * PacketCollector myCollector = packetReader.createPacketCollector(myFilter);
+ * </pre>
+ *
+ * @see org.jivesoftware.smack.PacketCollector
+ * @see org.jivesoftware.smack.PacketListener
+ * @author Matt Tucker
+ */
+public interface PacketFilter {
+
+    /**
+     * Tests whether or not the specified packet should pass the filter.
+     *
+     * @param packet the packet to test.
+     * @return true if and only if <tt>packet</tt> passes the filter.
+     */
+    public boolean accept(Packet packet);
+}