diff --git a/README.md b/README.md
index ce2a981..4dcceef 100644
--- a/README.md
+++ b/README.md
@@ -196,6 +196,7 @@ You can build a Vagrant VM with:
 
 ```bash
 wget https://raw.githubusercontent.com/zardus/ctf-tools/master/Vagrantfile
+vagrant plugin install vagrant-vbguest
 vagrant up
 ```