Readme.md in vagrant-vbguest-0.13.0 vs Readme.md in vagrant-vbguest-0.14.0.pre.beta1

@@ -268,9 +268,15 @@
   config.vbguest.installer = MyInstaller
 end
 ```
 
 
+### Extending vbguest (aka Very Advanced Usage)
+
+If you find yourself copying the same installer in each of your vagrant project, it might be a good idea to make it a plugin itself. Like vagrant-vbguest itself, installers can be [distributed as ruby gems](http://guides.rubygems.org/publishing/)
+
+This poroject contains a [sample installer gem](https://github.com/dotless-de/vagrant-vbguest/tree/master/testdrive/vagrant-vbguest-unikorn) which might serve as an boilerplate. 
+
 ## Known Issues
 
 * The installer script, which mounts and runs the GuestAdditions Installer Binary, works on Linux only. Most likely it will run on most Unix-like platforms.
 * The installer script requires a writeable upload directory on the guest system. This defaults to `/tmp` but can be overwritten with the `iso_upload_path` option.
 * The installer script requires a valid mount point on the guest system. This defaults to `/mnt` but can be overwritten with the `iso_mount_point` option.