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diff --git a/org/apache/commons/net/telnet/TelnetNotificationHandler.java b/org/apache/commons/net/telnet/TelnetNotificationHandler.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.commons.net.telnet;
+
+/***
+ * The TelnetNotificationHandler interface can be used to handle
+ * notification of options negotiation commands received on a telnet
+ * session.
+ * <p>
+ * The user can implement this interface and register a
+ * TelnetNotificationHandler by using the registerNotificationHandler()
+ * of TelnetClient to be notified of option negotiation commands.
+ * <p>
+ * <p>
+ * @author Bruno D'Avanzo
+ ***/
+
+public interface TelnetNotificationHandler
+{
+    /***
+     * The remote party sent a DO command.
+     ***/
+    public static final int RECEIVED_DO =   1;
+
+    /***
+     * The remote party sent a DONT command.
+     ***/
+    public static final int RECEIVED_DONT = 2;
+
+    /***
+     * The remote party sent a WILL command.
+     ***/
+    public static final int RECEIVED_WILL = 3;
+
+    /***
+     * The remote party sent a WONT command.
+     ***/
+    public static final int RECEIVED_WONT = 4;
+
+    /***
+     * Callback method called when TelnetClient receives an option
+     * negotiation command.
+     * <p>
+     * @param negotiation_code - type of negotiation command received
+     * (RECEIVED_DO, RECEIVED_DONT, RECEIVED_WILL, RECEIVED_WONT)
+     * <p>
+     * @param option_code - code of the option negotiated
+     * <p>
+     ***/
+    public void receivedNegotiation(int negotiation_code, int option_code);
+}