diff --git a/doc/source/requirements.rst b/doc/source/requirements.rst
index 2d77577..96f0f0c 100644
--- a/doc/source/requirements.rst
+++ b/doc/source/requirements.rst
@@ -1,8 +1,20 @@
 Requirements
 ============
 
+Vagrant
+-------
+
 The installation of Vagrant is documented in the `Vagrant
 documentation <https://docs.vagrantup.com/v2/installation/index.html>`__.
+Ensure to use at least version ``1.7.2`` of Vagrant.
+
+::
+
+    $ vagrant --version
+    Vagrant 1.7.2
+
+Ansible
+-------
 
 The used provisioner is `Ansible <http://www.ansible.com>`__. To be able
 to start this Vagrant environment install Ansible on the Vagrant host.
@@ -11,6 +23,9 @@ to start this Vagrant environment install Ansible on the Vagrant host.
 
     $ sudo yum install -y ansible
 
+PyYAML
+------
+
 A helper script (`scripts/get_hosts.py`) requires the Python library
 `PyYAML <https://pypi.python.org/pypi/PyYAML/3.11>`__.