diff --git a/docs/builds.rst b/docs/builds.rst
index 578d2879..cead9ba8 100644
--- a/docs/builds.rst
+++ b/docs/builds.rst
@@ -67,3 +67,14 @@ Here is the snapshot of the command line of one build, you may use different def
     $ qmake -qt=5 -makefile
     $ make
     $ ./dust3d
+
+* Fedora
+
+.. code-block:: sh
+
+    $ sudo dnf install qt5-qtbase-devel CGAL-devel
+    $ git clone https://github.com/huxingyi/dust3d.git
+    $ cd dust3d
+    $ qmake-qt5 -makefile
+    $ make
+    $ ./dust3d
diff --git a/dust3d.pro b/dust3d.pro
index f1308e95..a08a0418 100644
--- a/dust3d.pro
+++ b/dust3d.pro
@@ -6,6 +6,9 @@ RESOURCES += resources.qrc
 
 LANGUAGES = zh_CN
 
+OBJECTS_DIR=obj
+MOC_DIR=moc
+
 ############## Generate .qm from .ts #######################
 
 # parameters: var, prepend, append
diff --git a/src/documentwindow.cpp b/src/documentwindow.cpp
index 0c3ca330..489c4cf5 100644
--- a/src/documentwindow.cpp
+++ b/src/documentwindow.cpp
@@ -506,6 +506,10 @@ DocumentWindow::DocumentWindow() :
     
     m_fileMenu->addSeparator();
 
+    m_quitAction = m_fileMenu->addAction(tr("&Quit"),
+                                         this, &DocumentWindow::close,
+                                         QKeySequence::Quit);
+
     connect(m_fileMenu, &QMenu::aboutToShow, [=]() {
         m_exportAsObjAction->setEnabled(m_graphicsWidget->hasItems());
         //m_exportAsObjPlusMaterialsAction->setEnabled(m_graphicsWidget->hasItems());
@@ -1174,26 +1178,38 @@ DocumentWindow *DocumentWindow::createDocumentWindow()
 {
     DocumentWindow *documentWindow = new DocumentWindow();
     documentWindow->setAttribute(Qt::WA_DeleteOnClose);
-    documentWindow->showMaximized();
+
+    QSize size = Preferences::instance().documentWindowSize();
+    if (size.isValid()) {
+        documentWindow->resize(size);
+        documentWindow->show();
+    } else {
+        documentWindow->showMaximized();
+    }
+
     return documentWindow;
 }
 
 void DocumentWindow::closeEvent(QCloseEvent *event)
 {
-    if (m_documentSaved) {
-        event->accept();
-        return;
+    if (! m_documentSaved) {
+        QMessageBox::StandardButton answer = QMessageBox::question(this,
+            APP_NAME,
+            tr("Do you really want to close while there are unsaved changes?"),
+            QMessageBox::Yes | QMessageBox::No,
+            QMessageBox::No);
+        if (answer == QMessageBox::No) {
+            event->ignore();
+            return;
+        }
     }
 
-    QMessageBox::StandardButton answer = QMessageBox::question(this,
-        APP_NAME,
-        tr("Do you really want to close while there are unsaved changes?"),
-        QMessageBox::Yes | QMessageBox::No,
-        QMessageBox::No);
-    if (answer == QMessageBox::Yes)
-        event->accept();
-    else
-        event->ignore();
+    QSize saveSize;
+    if (!isMaximized())
+        saveSize = size();
+    Preferences::instance().setDocumentWindowSize(saveSize);
+
+    event->accept();
 }
 
 void DocumentWindow::setCurrentFilename(const QString &filename)
diff --git a/src/documentwindow.h b/src/documentwindow.h
index 6073f4a6..4c051aab 100644
--- a/src/documentwindow.h
+++ b/src/documentwindow.h
@@ -118,6 +118,7 @@ private:
     QAction *m_showPreferencesAction;
     QMenu *m_exportMenu;
     QAction *m_changeTurnaroundAction;
+    QAction *m_quitAction;
     
     QAction *m_exportAsObjAction;
     QAction *m_exportAsObjPlusMaterialsAction;
diff --git a/src/preferences.cpp b/src/preferences.cpp
index d67b93f4..ed007771 100644
--- a/src/preferences.cpp
+++ b/src/preferences.cpp
@@ -81,6 +81,16 @@ void Preferences::setFlatShading(bool flatShading)
     emit flatShadingChanged();
 }
 
+QSize Preferences::documentWindowSize() const
+{
+    return m_settings.value("documentWindowSize", QSize()).toSize();
+}
+
+void Preferences::setDocumentWindowSize(const QSize& size)
+{
+    m_settings.setValue("documentWindowSize", size);
+}
+
 void Preferences::reset()
 {
     m_settings.clear();
diff --git a/src/preferences.h b/src/preferences.h
index 4d5120c5..d558e9e3 100644
--- a/src/preferences.h
+++ b/src/preferences.h
@@ -2,6 +2,7 @@
 #define PREFERENCES_H
 #include <QSettings>
 #include <QColor>
+#include <QSize>
 #include "combinemode.h"
 
 class Preferences : public QObject
@@ -13,6 +14,8 @@ public:
     CombineMode componentCombineMode() const;
     const QColor &partColor() const;
     bool flatShading() const;
+    QSize documentWindowSize() const;
+    void setDocumentWindowSize(const QSize&);
 signals:
     void componentCombineModeChanged();
     void partColorChanged();