missing cd

README.md

@@ -339,6 +339,7 @@ follow the example below:
 
 ``` bash
 $ git clone https://github.com/$YOURUSERNAME/erlang.mk
+$ cd erlang.mk
 $ ./pkg_add.sh cowboy git https://github.com/ninenines/cowboy 1.0.0 http://ninenines.eu "Small, fast and modular HTTP server."
 $ git push origin master
 ```