diff --git a/README.md b/README.md
index 855f956..a1b2960 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,15 @@ To minimize wrist strain when labeling, I adopted the method **"twice left butto
 
 ![endimage](https://user-images.githubusercontent.com/35001605/47704336-a6528180-dc66-11e8-8551-3ecb612b7353.PNG)
 
+## USAGE AND OPTIONS
+```
+./YoloLabel [dataset dir] [class file names]
+# Example
+./YoloLabel ../project/dataset/objects/frames ../project/dataset/objects/obj_names.txt
+
+```
+
+
 ## SHORTCUTS
 
 | Key | Action |
diff --git a/main.cpp b/main.cpp
index 29e1450..0094c74 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,6 +5,7 @@ int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
     MainWindow w;
+    w.set_args(argc, argv);
     w.show();
     return a.exec();
 }
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 34cccc4..846f951 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -41,6 +41,20 @@ MainWindow::~MainWindow()
     delete ui;
 }
 
+void MainWindow::set_args(int argc, char *argv[])
+{
+  if (argc > 1) {
+    QString dir = QString::fromLocal8Bit(argv[1]);
+    get_files(dir);
+    if (argc > 2) {
+      QString obj_file = QString::fromLocal8Bit(argv[2]);
+      load_label_list_data(obj_file);
+    }
+    init();
+  }
+}
+
+
 void MainWindow::on_pushButton_open_files_clicked()
 {
     bool bRetImgDir     = false;
@@ -295,20 +309,9 @@ void MainWindow::pjreddie_style_msgBox(QMessageBox::Icon icon, QString title, QS
     msgBox.exec();
 }
 
-void MainWindow::open_img_dir(bool& ret)
+bool MainWindow::get_files(QString imgDir)
 {
-    pjreddie_style_msgBox(QMessageBox::Information,"Help", "Step 1. Open Your Data Set Directory");
-
-    QString opened_dir;
-    if(m_imgDir.size() > 0) opened_dir = m_imgDir;
-    else opened_dir = QDir::currentPath();
-
-    QString imgDir = QFileDialog::getExistingDirectory(
-                nullptr,
-                tr("Open Dataset Directory"),
-                opened_dir,
-                QFileDialog::ShowDirsOnly);
-
+    bool value = false;
     QDir dir(imgDir);
     QCollator collator;
     collator.setNumericMode(true);
@@ -319,20 +322,36 @@ void MainWindow::open_img_dir(bool& ret)
 
     std::sort(fileList.begin(), fileList.end(), collator);
 
-    if(fileList.empty())
-    {
-        ret = false;
-        pjreddie_style_msgBox(QMessageBox::Critical,"Error", "This folder is empty");
-    }
-    else
+    if(!fileList.empty())
     {
-        ret = true;
+        value = true;
         m_imgDir    = imgDir;
         m_imgList  = fileList;
 
         for(QString& str: m_imgList)
             str = m_imgDir + "/" + str;
     }
+    return value;
+}
+
+void MainWindow::open_img_dir(bool& ret)
+{
+    pjreddie_style_msgBox(QMessageBox::Information,"Help", "Step 1. Open Your Data Set Directory");
+
+    QString opened_dir;
+    if(m_imgDir.size() > 0) opened_dir = m_imgDir;
+    else opened_dir = QDir::currentPath();
+
+    QString imgDir = QFileDialog::getExistingDirectory(
+                nullptr,
+                tr("Open Dataset Directory"),
+                opened_dir,
+                QFileDialog::ShowDirsOnly);
+
+
+    ret = get_files(imgDir);
+    if (!ret)
+        pjreddie_style_msgBox(QMessageBox::Critical,"Error", "This folder is empty");
 }
 
 void MainWindow::open_obj_file(bool& ret)
diff --git a/mainwindow.h b/mainwindow.h
index f958522..dd7cf62 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -20,6 +20,8 @@ class MainWindow : public QMainWindow
 public:
     explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow();
+    void set_args(int argc, char *argv[]);
+
 
 private slots:
     void on_pushButton_open_files_clicked();
@@ -79,9 +81,11 @@ private slots:
     int             m_objIndex;
     int             m_lastDeletedImgIndex;
     int             m_lastLabeledImgIndex;
+    bool            get_files(QString imgDir);
 
 protected:
     void    wheelEvent(QWheelEvent *);
+
 };
 
 #endif // MAINWINDOW_H