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diff --git a/src/main/java/com/amazon/carbonado/PrimaryKey.java b/src/main/java/com/amazon/carbonado/PrimaryKey.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 a {@link Storable} property as being a member of the primary
+ * key. All Storable types must have at least one property belonging to the
+ * primary key.
+ *
+ * <p>Example:<pre>
+ * <b>&#64;PrimaryKey</b>("userInfoID")
+ * public interface UserInfo extends Storable&lt;UserInfo&gt; {
+ *     long getUserInfoID();
+ *
+ *     ...
+ * }
+ * </pre>
+ *
+ * @author Brian S O'Neill
+ * @see AlternateKeys
+ * @see Sequence
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+public @interface PrimaryKey {
+    /**
+     * A list of property names, which may be prefixed with '+' or '-' to
+     * indicate a preference for ascending or descending order.
+     */
+    String[] value();
+}