diff --git a/README.md b/README.md
index 16fa1d8..95f0b68 100644
--- a/README.md
+++ b/README.md
@@ -4,8 +4,9 @@ A Vagrant libvirt kvm cluster to test Ceph distributed storage
 ### Cluster Design 
 ### Pre-flight
 ### References
-* Vagrant: https://www.vagrantup.com/
-* Bento boxes: https://app.vagrantup.com/bento
 * Ceph: http://ceph.com/
+* Vagrant: https://www.vagrantup.com/
+* Vagrant libvirt plugin: https://github.com/vagrant-libvirt/vagrant-libvirt
+* Bento boxes: https://app.vagrantup.com/bento
 * Libvirt: https://libvirt.org/
 * KVM: https://www.linux-kvm.org/page/Main_Page