diff --git a/src/riscv-ubuntu/README.md b/src/riscv-ubuntu/README.md
index 58f6802..9ad0c8f 100644
--- a/src/riscv-ubuntu/README.md
+++ b/src/riscv-ubuntu/README.md
@@ -51,7 +51,7 @@
 cd riscv-ubuntu/
 
 # QEMU
-git clone https://github.com/qemu/qemu
+git clone https://github.com/qemu/qemu --recursive
 cd qemu
 git checkout 0021c4765a6b83e5b09409b75d50c6caaa6971b9
 ./configure --target-list=riscv64-softmmu