diff --git a/docs/RISC-V64_QEMU.md b/docs/RISC-V64_QEMU.md
index 50d5a6b..f0c7a7d 100644
--- a/docs/RISC-V64_QEMU.md
+++ b/docs/RISC-V64_QEMU.md
@@ -71,6 +71,12 @@ U_BOOT_FDT_DIR="noexist"
 EOF
 ```
 
+```
+passwd root
+apt-get install openntpd ntpdate
+sed -i 's/^DAEMON_OPTS="/DAEMON_OPTS="-s /' /etc/default/openntpd
+```
+
 CP kernel file.
 
 ```