List Puppet module prerequisites

doc/prerequisites.md

@@ -15,6 +15,24 @@ Just as obviously, your OpenStack nodes need to be configured as
 Puppet agents, also running Puppet 3 or later, properly authenticated
 to the master and able to run `puppet agent`.
 
+## Puppet modules
+
+Besides the dependencies listed in the [Modulefile](../Modulefile),
+Kickstack requires a couple of other modules currently not yet
+available on the Puppet Forge. You will have to fetch and install them
+from GitHub:
+
+* [`quantum`](https://github.com/stackforge/puppet-quantum), managing
+  OpenStack Networking,
+* [`vswitch`](https://github.com/CiscoSystems/puppet-vswitch),
+  managing OpenVSwitch
+
+In addition, the `glance` module, as available in its 2.0.0 version
+from the Puppet Forge, was unfortunately released with a bug that
+renders it unsuitable for use with Ubuntu. Until a new version of that
+module is released, you will also have to fetch the `glance` module
+from [GitHub](https://github.com/stackforge/puppet-glance).
+
 ## Networking prerequisites
 
 Kickstack requires that your cloud infrastructure has access to 3
@@ -22,7 +40,7 @@ different networks:
 
 * The **management network,** which your cloud nodes use for access to
   the database, RPC service, and OpenStack APIs.
-* The **data network,** which run the internal, virtual networks
+* The **data network,** which runs the internal, virtual networks
   managed by OpenStack Networking.
 * The **external network**, which connects your cloud to the outside
   world.