Weird documentation for ItemSceneHasChanged and ItemSceneChange in QGraphicsItem::GraphicsItemChange

ItemSceneChange: The item is moved to a new scene. This notification is also sent when the item is added to its initial scene, and when it is removed. The value argument is ...

ItemSceneHasChanged: The item's scene has changed. The value argument is the new scene (i.e., a pointer to a QGraphicsScene). ...

But actually:
1) ItemSceneHasChanged is also sent when the item is added to its initial scene or removing from scene.
2) ItemSceneChange happens right before scene change (scene() points to old scene) and ItemSceneHasChanged happens right after scene change (scene() points to new scene).

That is not obvious so better put that into documentation. Something like:

ItemSceneChange: The item is prepared for moving to a new scene. This notification is also sent before the item is added to its initial scene, and when it is removed. scene() points to old scene. The value argument is ...

ItemSceneHasChanged: The item is moved to a new scene. This notification is also sent when the item is added to its initial scene, and when it is removed. scene() points to new scene. ...

Sorry for bad English.