diff --git a/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala b/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
index e1fb87a9e1e13..22d1cb8b708cd 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
@@ -138,7 +138,8 @@ private[sql] object Dataset {
  * the following creates a new Dataset by applying a filter on the existing one:
  * {{{
  *   val names = people.map(_.name)  // in Scala; names is a Dataset[String]
- *   Dataset<String> names = people.map((Person p) -> p.name, Encoders.STRING));
+ *   Dataset<String> names = people.map(
+ *     (MapFunction<Person, String>) p -> p.name, Encoders.STRING()); // Java
  * }}}
  *
  * Dataset operations can also be untyped, through various domain-specific-language (DSL)