diff --git a/AdvancedDockingSystem/include/ads/ContainerWidget.h b/AdvancedDockingSystem/include/ads/ContainerWidget.h
index 16c6c52..61e5096 100644
--- a/AdvancedDockingSystem/include/ads/ContainerWidget.h
+++ b/AdvancedDockingSystem/include/ads/ContainerWidget.h
@@ -14,6 +14,7 @@ class QGridLayout;
 #include "ads/Internal.h"
 #include "ads/SectionContent.h"
 #include "ads/FloatingWidget.h"
+#include "ads/Serialization.h"
 
 ADS_NAMESPACE_BEGIN
 class SectionWidget;
@@ -129,6 +130,9 @@ private:
 	QByteArray saveHierarchy() const;
 	void saveFloatingWidgets(QDataStream& out) const;
 	void saveSectionWidgets(QDataStream& out, QWidget* widget) const;
+
+	bool saveSectionIndex(ADS_NS_SER::SectionIndexData &sid) const;
+
 	bool restoreHierarchy(const QByteArray& data);
 	bool restoreFloatingWidgets(QDataStream& in, int version, QList<FloatingWidget*>& floatings);
 	bool restoreSectionWidgets(QDataStream& in, int version, QSplitter* currentSplitter, QList<SectionWidget*>& sections, QList<SectionContent::RefPtr>& contentsToHide);
diff --git a/AdvancedDockingSystem/include/ads/Serialization.h b/AdvancedDockingSystem/include/ads/Serialization.h
index 7f7ec03..8e50e8d 100644
--- a/AdvancedDockingSystem/include/ads/Serialization.h
+++ b/AdvancedDockingSystem/include/ads/Serialization.h
@@ -65,6 +65,8 @@ class ADS_EXPORT_API SectionEntity
 {
 public:
 	SectionEntity();
+	qint32 x;
+	qint32 y;
 	qint32 width;
 	qint32 height;
 	qint32 currentIndex;
diff --git a/AdvancedDockingSystem/src/ContainerWidget.cpp b/AdvancedDockingSystem/src/ContainerWidget.cpp
index a9de1d2..16f04b2 100644
--- a/AdvancedDockingSystem/src/ContainerWidget.cpp
+++ b/AdvancedDockingSystem/src/ContainerWidget.cpp
@@ -369,10 +369,10 @@ QByteArray ContainerWidget::saveState() const
 	}
 
 	// SectionIndex data.
-	const QByteArray sectionIndexData;
-	if (!sectionIndexData.isEmpty())
+	ADS_NS_SER::SectionIndexData sid;
+	if (saveSectionIndex(sid))
 	{
-		writer.write(ADS_NS_SER::ET_SectionIndex, sectionIndexData);
+		writer.write(sid);
 	}
 
 	if (writer.offsetsCount() == 0)
@@ -844,6 +844,34 @@ void ContainerWidget::saveSectionWidgets(QDataStream& out, QWidget* widget) cons
 	}
 }
 
+bool ContainerWidget::saveSectionIndex(ADS_NS_SER::SectionIndexData& sid) const
+{
+	if (_sections.count() <= 0)
+		return false;
+
+	sid.sectionsCount = _sections.count();
+	for (int i = 0; i < _sections.count(); ++i)
+	{
+		ADS_NS_SER::SectionEntity se;
+		se.x = _sections[i]->geometry().x();
+		se.y = _sections[i]->geometry().y();
+		se.width = _sections[i]->geometry().width();
+		se.height = _sections[i]->geometry().height();
+		se.currentIndex = _sections[i]->currentIndex();
+		se.sectionContentsCount = _sections[i]->contents().count();
+		foreach (const SectionContent::RefPtr& sc, _sections[i]->contents())
+		{
+			ADS_NS_SER::SectionContentEntity sce;
+			sce.uniqueName = sc->uniqueName();
+			sce.visible = true;
+			sce.preferredIndex = _sections[i]->indexOfContent(sc);
+			se.sectionContents.append(sce); // std::move()?
+		}
+		sid.sections.append(se); // std::move()?
+	}
+	return true;
+}
+
 bool ContainerWidget::restoreHierarchy(const QByteArray& data)
 {
 	QDataStream in(data);
diff --git a/AdvancedDockingSystem/src/Serialization.cpp b/AdvancedDockingSystem/src/Serialization.cpp
index 5efc620..e7df053 100644
--- a/AdvancedDockingSystem/src/Serialization.cpp
+++ b/AdvancedDockingSystem/src/Serialization.cpp
@@ -147,6 +147,8 @@ SectionEntity::SectionEntity() :
 
 QDataStream& operator<<(QDataStream& out, const SectionEntity& data)
 {
+	out << data.x;
+	out << data.y;
 	out << data.width;
 	out << data.height;
 	out << data.currentIndex;
@@ -160,6 +162,8 @@ QDataStream& operator<<(QDataStream& out, const SectionEntity& data)
 
 QDataStream& operator>>(QDataStream& in, SectionEntity& data)
 {
+	in >> data.x;
+	in >> data.y;
 	in >> data.width;
 	in >> data.height;
 	in >> data.currentIndex;