Starting documentation and privatising unnecessary exports
diff --git a/openstack/networking/v2/extensions/doc.go b/openstack/networking/v2/extensions/doc.go
index aeec0fa..7942c39 100644
--- a/openstack/networking/v2/extensions/doc.go
+++ b/openstack/networking/v2/extensions/doc.go
@@ -1 +1,15 @@
+// Package extensions provides information and interaction with the different
+// extensions available for the OpenStack Neutron service.
+//
+// The purpose of Networking API v2.0 extensions is to:
+//
+// - Introduce new features in the API without requiring a version change.
+// - Introduce vendor-specific niche functionality.
+// - Act as a proving ground for experimental functionalities that might be
+// included in a future version of the API.
+//
+// Extensions usually have tags that prevent conflicts with other extensions
+// that define attributes or resources with the same names, and with core
+// resources and attributes. Because an extension might not be supported by all
+// plug-ins, its availability varies with deployments and the specific plug-in.
package extensions