diff --git a/README.md b/README.md
index 11c76af..fcf0710 100644
--- a/README.md
+++ b/README.md
@@ -22,8 +22,15 @@ mv plib-dist install
 
 ```
 
+mkdir FGFS
+
+cd FGFS
+
 git clone https://git.kongjian.xin/FGFS-4.0/fgdata.git
 
+git clone https://git.kongjian.xin/FGFS-4.0/plib-mac-dist.git
+
+mv plib-mac-dist install
 
 git clone https://github.com/openscenegraph/OpenSceneGraph.git
 cd OpenSceneGraph