diff --git a/exercises/src/chapter3/queue/Queue.scala b/exercises/src/chapter3/queue/Queue.scala
index e2a0c38..322b426 100644
--- a/exercises/src/chapter3/queue/Queue.scala
+++ b/exercises/src/chapter3/queue/Queue.scala
@@ -12,6 +12,7 @@ trait Queue[T] {
 private case class Node[T](value: Option[T], next: Option[Node[T]])
     extends Queue[T] {
 
+  //should make it private ? but it is ok now
   def empty[T]: Node[T] = Node(None, None)
   override def isEmpty: Boolean = value.isEmpty