Vagrant: Update requirements.

fixes #4881

diff --git a/doc/9-vagrant-demo-vm.md b/doc/9-vagrant-demo-vm.md
index 0e78fa59b0a22bb573266b9ee42a69692cfabe44..4997c148f9e7f41b9019993cad319a60ec6225a8 100644 (file)
--- a/doc/9-vagrant-demo-vm.md
+++ b/doc/9-vagrant-demo-vm.md
@@ -1,7 +1,8 @@
 # <a id="vagrant"></a> Vagrant Demo VM
 
-The Icinga 2 Git repository contains support for Vagrant. In order to build the
-Vagrant VM first you will have to check out the Git repository:
+The Icinga 2 Git repository contains support for [Vagrant](http://docs.vagrantup.com/v2/)
+with VirtualBox. In order to build the Vagrant VM first you will have to check out
+the Git repository:
 
     $ git clone git://git.icinga.org/icinga2.git
 
@@ -10,6 +11,12 @@ following command:
 
     $ vagrant up
 
+> **Note**
+>
+> Vagrant and VirtualBox are available for various distributions. Please note
+> that Vagrant version `1.0.x` is not supported. At least version `1.2.x` is
+> required to be installed (for example from [http://downloads.vagrantup.com](http://downloads.vagrantup.com)).
+
 The Vagrant VM is based on CentOS 6.4 and uses the official Icinga 2 RPM
 packages from `packages.icinga.org`.