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diff --git a/java/com/google/gerrit/extensions/annotations/Listen.java b/java/com/google/gerrit/extensions/annotations/Listen.java
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+++ b/java/com/google/gerrit/extensions/annotations/Listen.java
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+// Copyright (C) 2012 The Android Open Source Project
+//
+// 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.gerrit.extensions.annotations;
+
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import com.google.inject.BindingAnnotation;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation for auto-registered extension point implementations.
+ *
+ * <p>Plugins or extensions using auto-registration should apply this annotation to any non-abstract
+ * class that implements an unnamed extension point, such as a notification listener. Gerrit will
+ * automatically determine which extension points to apply based on the interfaces the type
+ * implements.
+ *
+ * @see Export
+ */
+@Target({ElementType.TYPE})
+@Retention(RUNTIME)
+@BindingAnnotation
+public @interface Listen {}