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diff --git a/guava/src/com/google/common/annotations/GwtCompatible.java b/guava/src/com/google/common/annotations/GwtCompatible.java
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+/*
+ * Copyright (C) 2009 The Guava Authors
+ *
+ * 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.google.common.annotations;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * The presence of this annotation on a type indicates that the type may be
+ * used with the
+ * <a href="http://code.google.com/webtoolkit/">Google Web Toolkit</a> (GWT).
+ * When applied to a method, the return type of the method is GWT compatible.
+ * It's useful to indicate that an instance created by factory methods has a GWT
+ * serializable type.  In the following example,
+ *
+ * <pre style="code">
+ * {@literal @}GwtCompatible
+ * class Lists {
+ *   ...
+ *   {@literal @}GwtCompatible(serializable = true)
+ *   static &lt;E> List&lt;E> newArrayList(E... elements) {
+ *     ...
+ *   }
+ * }
+ * </pre>
+ * The return value of {@code Lists.newArrayList(E[])} has GWT
+ * serializable type.  It is also useful in specifying contracts of interface
+ * methods.  In the following example,
+ *
+ * <pre style="code">
+ * {@literal @}GwtCompatible
+ * interface ListFactory {
+ *   ...
+ *   {@literal @}GwtCompatible(serializable = true)
+ *   &lt;E> List&lt;E> newArrayList(E... elements);
+ * }
+ * </pre>
+ * The {@code newArrayList(E[])} method of all implementations of {@code
+ * ListFactory} is expected to return a value with a GWT serializable type.
+ *
+ * <p>Note that a {@code GwtCompatible} type may have some {@link
+ * GwtIncompatible} methods.
+ *
+ * @author Charles Fry
+ * @author Hayward Chan
+ */
+@Retention(RetentionPolicy.CLASS)
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Documented
+@GwtCompatible
+public @interface GwtCompatible {
+
+  /**
+   * When {@code true}, the annotated type or the type of the method return
+   * value is GWT serializable.
+   *
+   * @see <a href="http://code.google.com/webtoolkit/doc/latest/DevGuideServerCommunication.html#DevGuideSerializableTypes">
+   *     Documentation about GWT serialization</a>
+   */
+  boolean serializable() default false;
+
+  /**
+   * When {@code true}, the annotated type is emulated in GWT. The emulated
+   * source (also known as super-source) is different from the implementation
+   * used by the JVM.
+   *
+   * @see <a href="http://code.google.com/webtoolkit/doc/latest/DevGuideOrganizingProjects.html#DevGuideModules">
+   *     Documentation about GWT emulated source</a>
+   */
+  boolean emulated() default false;
+}