diff --git a/src/main.cpp b/src/main.cpp
index 3a540c9..319368e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -8,15 +8,16 @@
 int main(int argc, char **argv) {
 	QApplication app(argc, argv);
 	QCommandLineParser parser;
-	QCommandLineOption mtl_filepath_opt({"m", "material"}, "Material file path", "path");
-	QCommandLineOption obj_filepath_opt({"o", "object"}, "Object file path", "path");
+	QCommandLineOption mtl_filepath_opt({"m", "material"}, "Material file path, required", "path");
+	QCommandLineOption obj_filepath_opt({"o", "object"}, "Object file path, required", "path");
+	parser.addHelpOption();
 	parser.addOption(mtl_filepath_opt);
 	parser.addOption(obj_filepath_opt);
 	parser.process(app);
 	QString mtl_filepath = parser.value(mtl_filepath_opt);
 	QString obj_filepath = parser.value(obj_filepath_opt);
 	if (mtl_filepath.isEmpty() || obj_filepath.isEmpty()) {
-		return -1;
+		return 1;
 	}
 	QMainWindow w;
 	Ui::MainWindow ui;