diff --git a/README.md b/README.md
index 1254408..9a0e7d7 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@
 
 ## Building on UNIX
 ```sh
+$ git clone --recursive https://github.com/awslabs/aws-crt-php.git
+$ cd aws-crt-php
 $ phpize
 $ ./configure
 $ make && make test