diff --git a/QUICK_START.md b/QUICK_START.md
index f0165bc8..60daba57 100644
--- a/QUICK_START.md
+++ b/QUICK_START.md
@@ -6,6 +6,8 @@ This project includes a Vagrantfile that will allow you to build a new firmware
 
 Using the Vagrantfile in this repository requires you have [Vagrant](http://www.vagrantup.com/) as well as [VirtualBox](https://www.virtualbox.org/) (or [VMware Workstation](https://www.vmware.com/products/workstation) and [Vagrant VMware plugin](http://www.vagrantup.com/vmware) but the (paid) VMware plugin requires a licensed copy of VMware Workstation/Fusion).
 
+*COMPATIBILITY NOTICE* Certain versions of Virtualbox 5 appear to have an incompatibility with the Virtualbox extensions installed in the boxes in this Vagrantfile. If you encounter any issues with the /vagrant mount not succeeding, please upgrade your version of Virtualbox to at least 5.0.12.
+
 Other than having Vagrant and Virtualbox installed and possibly a restart of your computer afterwards, you can simple run a 'vagrant up' anywhere inside the folder where you checked out this project and it will start a Linux virtual machine that contains all the tools required to build this project. There is a post Vagrant startup hint that will get you off on the right foot, otherwise you can also reference the build documentation below.
 
 Build Firmware and Program Controller