diff --git a/docs/development.rst b/docs/development.rst
index affb4b1cdc2144dc5131a4611d0480381a0ec3eb..558f3bce66d044b8c553a5469dc10abc68f22fee 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -36,21 +36,37 @@ performing the following steps:
    to use latest versions available. At time of this writing the role tests have
    been successfully run on *VirtualBox 5.2.12* and *Vagrant 2.0.4*.
 
-3. Clone the git repository::
+3. In order to allow static IPv6 addresses to be allocated to virtual
+   machines during testing, it is necessary to explicitly white-list
+   the range used by the tests. Once the configuration file has been
+   created, however, even the VirtualBox default allowed IPv4 subnet
+   needs to be in the configuration explicitly as well.
+
+   Update the VirtulBox configuration file (and make sure it can be
+   read by the user running the tests):
+
+   :file:`/etc/vbox/networks.conf`
+
+   ::
+
+     * 192.168.56.0/21
+     * fd00::192:168:56:0/116
+
+4. Clone the git repository::
 
      git clone https://code.majic.rs/majic-ansible-roles/ ~/projects/
 
-4. Create a separate Python virtual environment::
+5. Create a separate Python virtual environment::
 
      mkvirtualenv majic-ansible-roles -a ~/projects/majic-ansible-roles/
 
-5. Make sure the virtual environment has been activated, and install `pip-tools
+6. Make sure the virtual environment has been activated, and install `pip-tools
    <https://github.com/jazzband/pip-tools>`_::
 
      workon majic-ansible-roles
      pip install pip-tools
 
-6. Synchronise Python virtual environment with requirements file using
+7. Synchronise Python virtual environment with requirements file using
    **pip-tools**::
 
      workon majic-ansible-roles