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diff --git a/core/src/main/scala/org/apache/spark/package.scala b/core/src/main/scala/org/apache/spark/package.scala
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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.
+ */
+
+/**
+ * Core Spark functionality. [[org.apache.spark.SparkContext]] serves as the main entry point to Spark, while
+ * [[org.apache.spark.RDD]] is the data type representing a distributed collection, and provides most
+ * parallel operations. 
+ *
+ * In addition, [[org.apache.spark.PairRDDFunctions]] contains operations available only on RDDs of key-value
+ * pairs, such as `groupByKey` and `join`; [[org.apache.spark.DoubleRDDFunctions]] contains operations
+ * available only on RDDs of Doubles; and [[org.apache.spark.SequenceFileRDDFunctions]] contains operations
+ * available on RDDs that can be saved as SequenceFiles. These operations are automatically
+ * available on any RDD of the right type (e.g. RDD[(Int, Int)] through implicit conversions when
+ * you `import org.apache.spark.SparkContext._`.
+ */
+package object spark { 
+  // For package docs only
+}