diff --git a/src/cmlib-example/main.cpp b/src/cmlib-example/main.cpp
index 40a22be..5cc645f 100644
--- a/src/cmlib-example/main.cpp
+++ b/src/cmlib-example/main.cpp
@@ -15,5 +15,12 @@ int main( int argc, char** argv )
 		qDebug() << i;
 	}
 
+	// loop add ref
+	QStringList sl;
+	for (auto s: sl)
+	{
+		qDebug() << s;
+	}
+
 	return( 0 );
 }