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diff --git a/src/main/java/com/amazon/carbonado/Nullable.java b/src/main/java/com/amazon/carbonado/Nullable.java
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+++ b/src/main/java/com/amazon/carbonado/Nullable.java
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+/*
+ * Copyright 2006 Amazon Technologies, Inc. or its affiliates.
+ * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
+ * of Amazon Technologies, Inc. or its affiliates.  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 com.amazon.carbonado;
+
+import java.lang.annotation.*;
+
+/**
+ * Identifies that a {@link Storable} property can have a null value. By
+ * default, all Storable properties are required to have a non-null value. It
+ * is illegal to declare a property as nullable whose type is a primitive
+ * non-object.
+ *
+ * <p>Example:<pre>
+ * public interface UserInfo extends Storable&lt;UserInfo&gt; {
+ *     <b>&#64;Nullable</b>
+ *     String getName();
+ *
+ *     ...
+ * }
+ * </pre>
+ *
+ * @author Brian S O'Neill
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.METHOD})
+public @interface Nullable {
+}