diff --git a/README.md b/README.md
index e0db1fa19..756a5f3fd 100644
--- a/README.md
+++ b/README.md
@@ -162,6 +162,8 @@ cortex-nightly hardware activate
 
 ```bash
 git clone https://github.com/janhq/cortex.cpp
+cd cortex.cpp
+git submodule update --init --recursive
 cd engine/vcpkg && ./bootstrap-vcpkg.sh
 cd ../build && cmake .. && make -j4
 ```