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diff --git a/common/tags/src/main/java/org/apache/spark/annotation/Experimental.java b/common/tags/src/main/java/org/apache/spark/annotation/Experimental.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.spark.annotation;
+
+import java.lang.annotation.*;
+
+/**
+ * An experimental user-facing API.
+ *
+ * Experimental API's might change or be removed in minor versions of Spark, or be adopted as
+ * first-class Spark API's.
+ *
+ * NOTE: If there exists a Scaladoc comment that immediately precedes this annotation, the first
+ * line of the comment must be ":: Experimental ::" with no trailing blank line. This is because
+ * of the known issue that Scaladoc displays only either the annotation or the comment, whichever
+ * comes first.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE, ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER,
+        ElementType.CONSTRUCTOR, ElementType.LOCAL_VARIABLE, ElementType.PACKAGE})
+public @interface Experimental {}