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diff --git a/src/main/java/com/amazon/carbonado/PartitionKey.java b/src/main/java/com/amazon/carbonado/PartitionKey.java
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+/*
+ * Copyright 2006-2010 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 a {@link Storable} property as being a member of the partition key.
+ * This key is ignored if the underlying repository lacks support for partitioning.
+ *
+ * <p>Example:<pre>
+ * &#64;PrimaryKey("userInfoID")
+ * <b>&#64;PartitionKey("userInfoGroup")</b>
+ * public interface UserInfo extends Storable&lt;UserInfo&gt; {
+ *     long getUserInfoID();
+ *     void setUserInfoID(long id);
+ *
+ *     String getUserInfoGroup();
+ *     void setUserInfoGroup(String group);
+ *
+ *     ...
+ * }
+ * </pre>
+ *
+ * @author Archit Shivaprakash
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+public @interface PartitionKey {
+    /**
+     * A list of property names.
+     */
+    String[] value() default {};
+}