diff --git a/XLSW_SONIC/main.c b/XLSW_SONIC/main.c
index c9174ca..31d2bfc 100644
--- a/XLSW_SONIC/main.c
+++ b/XLSW_SONIC/main.c
@@ -1,3 +1,4 @@
+// test
 /*!
     \file    main.c
     \brief   led spark with systick, USART print and key example