diff --git a/documents/Installing.md b/documents/Installing.md
index 1bcd0c0a588a905b76c60b092e9b012073e16d42..81e4d0a1a8357a2c3ee18b15d22daf2bc71c23e1 100644
--- a/documents/Installing.md
+++ b/documents/Installing.md
@@ -34,6 +34,7 @@ $ qemu-system-riscv64 \
   -device virtio-rng-device,rng=rng0 \
   -device virtio-blk-device,drive=hd0 \
   -device virtio-net-device,netdev=usernet \
+  --append "root=/dev/vda1" \
   -netdev user,id=usernet,hostfwd=tcp::12055-:22
 ```
 当系统启动之后，可以通过ssh登陆guest OS