diff --git a/src/DockWidget.cpp b/src/DockWidget.cpp
index a828dc8..c990209 100644
--- a/src/DockWidget.cpp
+++ b/src/DockWidget.cpp
@@ -195,6 +195,7 @@ void DockWidgetPrivate::showDockWidget()
 		}
 
         // If this widget is pinned and there are no opened dock widgets, unpin the overlay widget by moving it's contents to parent container
+		// While restoring state, opened dock widgets are not valid
 		if (Container->openedDockWidgets().count() == 0 && DockArea->isOverlayed() && !DockManager->isRestoringState())
 		{
 			DockArea->overlayDockContainer()->moveContentsToParent();