diff --git a/akka-actor/src/main/scala/akka/dispatch/Future.scala b/akka-actor/src/main/scala/akka/dispatch/Future.scala
index 7e6d6d9010..344c6d4437 100644
--- a/akka-actor/src/main/scala/akka/dispatch/Future.scala
+++ b/akka-actor/src/main/scala/akka/dispatch/Future.scala
@@ -78,15 +78,16 @@ object ExecutionContexts {
   def global(): ExecutionContextExecutor = ExecutionContext.global
 
   /**
+   * INTERNAL API
+   *
    * WARNING: Not A General Purpose ExecutionContext!
    *
    * This is an execution context which runs everything on the calling thread.
    * It is very useful for actions which are known to be non-blocking and
    * non-throwing in order to save a round-trip to the thread pool.
    *
-   * INTERNAL API
+   * Once Scala 2.12 is no longer supported this can be dropped in favour of directly using `ExecutionContext.parasitic`
    */
-  // Once Scala 2.12 is no longer supported this can be dropped in favour of directly using [[ExecutionContext.parasitic]]
   @InternalStableApi
   private[akka] val parasitic: ExecutionContext = SameThreadExecutionContext()
 
diff --git a/akka-actor/src/main/scala/akka/util/JavaDurationConverters.scala b/akka-actor/src/main/scala/akka/util/JavaDurationConverters.scala
index c344f72058..cefe1a2e28 100644
--- a/akka-actor/src/main/scala/akka/util/JavaDurationConverters.scala
+++ b/akka-actor/src/main/scala/akka/util/JavaDurationConverters.scala
@@ -7,9 +7,12 @@ import java.time.{ Duration => JDuration }
 
 import scala.concurrent.duration.{ Duration, FiniteDuration }
 
+import akka.annotation.InternalStableApi
+
 /**
  * INTERNAL API
  */
+@InternalStableApi
 private[akka] object JavaDurationConverters {
   def asFiniteDuration(duration: JDuration): FiniteDuration = duration.asScala