diff --git a/4G/4g.c b/4G/4g.c
index 2ecb101..2d3a726 100644
--- a/4G/4g.c
+++ b/4G/4g.c
@@ -22,3 +22,8 @@ void sch_4g_message(void)
 {
   printf("hello 20200820 \n");	
 }
+
+void sch_4g_memu()
+{
+return 2020.8.22;
+}