diff --git a/akka-stream/src/main/scala/akka/stream/OverflowStrategy.scala b/akka-stream/src/main/scala/akka/stream/OverflowStrategy.scala
index 04e9067301..dd1e860c84 100644
--- a/akka-stream/src/main/scala/akka/stream/OverflowStrategy.scala
+++ b/akka-stream/src/main/scala/akka/stream/OverflowStrategy.scala
@@ -25,6 +25,9 @@ object OverflowStrategy {
    */
   private[akka] final case object DropBuffer extends OverflowStrategy
 
+  /**
+   * INTERNAL API
+   */
   private[akka] final case object DropNew extends OverflowStrategy
 
   /**