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diff --git a/src/main/java/org/apache/commons/lang3/NotImplementedException.java b/src/main/java/org/apache/commons/lang3/NotImplementedException.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.lang3;
+
+/**
+ * Thrown to indicate that a block of code has not been implemented.
+ * This exception supplements {@link UnsupportedOperationException}
+ * by providing a more semantically rich description of the problem.
+ *
+ * <p>{@link NotImplementedException} represents the case where the
+ * author has yet to implement the logic at this point in the program.
+ * This can act as an exception based TODO tag.</p>
+ *
+ * <pre>
+ * public void foo() {
+ *   try {
+ *     // do something that throws an Exception
+ *   } catch (Exception ex) {
+ *     // don't know what to do here yet
+ *     throw new NotImplementedException("TODO", ex);
+ *   }
+ * }
+ * </pre>
+ *
+ * This class was originally added in Lang 2.0, but removed in 3.0.
+ *
+ * @since 3.2
+ */
+public class NotImplementedException extends UnsupportedOperationException {
+
+    private static final long serialVersionUID = 20131021L;
+
+    /** A resource for more information regarding the lack of implementation. */
+    private final String code;
+
+    /**
+     * Constructs a NotImplementedException.
+     *
+     * @since 3.10
+     */
+    public NotImplementedException() {
+        this.code = null;
+    }
+
+    /**
+     * Constructs a NotImplementedException.
+     *
+     * @param message description of the exception
+     * @since 3.2
+     */
+    public NotImplementedException(final String message) {
+        this(message, (String) null);
+    }
+
+    /**
+     * Constructs a NotImplementedException.
+     *
+     * @param cause cause of the exception
+     * @since 3.2
+     */
+    public NotImplementedException(final Throwable cause) {
+        this(cause, null);
+    }
+
+    /**
+     * Constructs a NotImplementedException.
+     *
+     * @param message description of the exception
+     * @param cause cause of the exception
+     * @since 3.2
+     */
+    public NotImplementedException(final String message, final Throwable cause) {
+        this(message, cause, null);
+    }
+
+    /**
+     * Constructs a NotImplementedException.
+     *
+     * @param message description of the exception
+     * @param code code indicating a resource for more information regarding the lack of implementation
+     * @since 3.2
+     */
+    public NotImplementedException(final String message, final String code) {
+        super(message);
+        this.code = code;
+    }
+
+    /**
+     * Constructs a NotImplementedException.
+     *
+     * @param cause cause of the exception
+     * @param code code indicating a resource for more information regarding the lack of implementation
+     * @since 3.2
+     */
+    public NotImplementedException(final Throwable cause, final String code) {
+        super(cause);
+        this.code = code;
+    }
+
+    /**
+     * Constructs a NotImplementedException.
+     *
+     * @param message description of the exception
+     * @param cause cause of the exception
+     * @param code code indicating a resource for more information regarding the lack of implementation
+     * @since 3.2
+     */
+    public NotImplementedException(final String message, final Throwable cause, final String code) {
+        super(message, cause);
+        this.code = code;
+    }
+
+    /**
+     * Obtain the not implemented code. This is an unformatted piece of text intended to point to
+     * further information regarding the lack of implementation. It might, for example, be an issue
+     * tracker ID or a URL.
+     *
+     * @return a code indicating a resource for more information regarding the lack of implementation
+     */
+    public String getCode() {
+        return this.code;
+    }
+}