diff --git a/private/abstractanimationprivate_p.h b/private/abstractanimationprivate_p.h
index 3780cf087..56ced6d1d 100644
--- a/private/abstractanimationprivate_p.h
+++ b/private/abstractanimationprivate_p.h
@@ -75,6 +75,10 @@ public:
      */
     qint8 reference;
 
+    /**
+     * Animation direction, I supose that the idea is to offer a way
+     * to rewind the animation by setDirection(QAbstractAnimation::Backward).
+     */
     bool forwards;
 };