diff --git a/openstack/networking/v2/apiversions/doc.go b/openstack/networking/v2/apiversions/doc.go
index 9ec7ea2..0208ee2 100644
--- a/openstack/networking/v2/apiversions/doc.go
+++ b/openstack/networking/v2/apiversions/doc.go
@@ -1,3 +1,4 @@
 // Package apiversions provides information and interaction with the different
-// API versions for the Neutron OpenStack service.
+// API versions for the OpenStack Neutron service. This functionality is not
+// restricted to this particular version.
 package apiversions
diff --git a/openstack/networking/v2/apiversions/requests.go b/openstack/networking/v2/apiversions/requests.go
index 570b9e8..b653f51 100644
--- a/openstack/networking/v2/apiversions/requests.go
+++ b/openstack/networking/v2/apiversions/requests.go
@@ -7,7 +7,7 @@
 
 // ListVersions lists all the Neutron API versions available to end-users
 func ListVersions(c *gophercloud.ServiceClient) pagination.Pager {
-	return pagination.NewPager(c, APIVersionsURL(c), func(r pagination.LastHTTPResponse) pagination.Page {
+	return pagination.NewPager(c, apiVersionsURL(c), func(r pagination.LastHTTPResponse) pagination.Page {
 		return APIVersionPage{pagination.SinglePageBase(r)}
 	})
 }
@@ -15,7 +15,7 @@
 // ListVersionResources lists all of the different API resources for a particular
 // API versions. Typical resources for Neutron might be: networks, subnets, etc.
 func ListVersionResources(c *gophercloud.ServiceClient, v string) pagination.Pager {
-	return pagination.NewPager(c, APIInfoURL(c, v), func(r pagination.LastHTTPResponse) pagination.Page {
+	return pagination.NewPager(c, apiInfoURL(c, v), func(r pagination.LastHTTPResponse) pagination.Page {
 		return APIVersionResourcePage{pagination.SinglePageBase(r)}
 	})
 }
diff --git a/openstack/networking/v2/apiversions/results.go b/openstack/networking/v2/apiversions/results.go
index 0ab3b41..e13998d 100644
--- a/openstack/networking/v2/apiversions/results.go
+++ b/openstack/networking/v2/apiversions/results.go
@@ -18,7 +18,7 @@
 	pagination.SinglePageBase
 }
 
-// IsEmpty checks whether the page is empty.
+// IsEmpty checks whether an APIVersionPage struct is empty.
 func (r APIVersionPage) IsEmpty() (bool, error) {
 	is, err := ExtractAPIVersions(r)
 	if err != nil {
@@ -27,7 +27,7 @@
 	return len(is) == 0, nil
 }
 
-// ExtractAPIVersion takes a collection page, extracts all of the elements,
+// ExtractAPIVersions takes a collection page, extracts all of the elements,
 // and returns them a slice of APIVersion structs. It is effectively a cast.
 func ExtractAPIVersions(page pagination.Page) ([]APIVersion, error) {
 	var resp struct {
@@ -49,10 +49,14 @@
 	Collection string `mapstructure:"collection" json:"collection"`
 }
 
+// APIVersionResourcePage is a concrete type which embeds the common
+// SinglePageBase struct, and is used when traversing API versions collections.
 type APIVersionResourcePage struct {
 	pagination.SinglePageBase
 }
 
+// IsEmpty is a concrete function which indicates whether an
+// APIVersionResourcePage is empty or not.
 func (r APIVersionResourcePage) IsEmpty() (bool, error) {
 	is, err := ExtractVersionResources(r)
 	if err != nil {
@@ -61,6 +65,10 @@
 	return len(is) == 0, nil
 }
 
+// ExtractVersionResources accepts a Page struct, specifically a
+// APIVersionResourcePage struct, and extracts the elements into a slice of
+// APIVersionResource structs. In other words, the collection is mapped into
+// a relevant slice.
 func ExtractVersionResources(page pagination.Page) ([]APIVersionResource, error) {
 	var resp struct {
 		APIVersionResources []APIVersionResource `mapstructure:"resources"`
diff --git a/openstack/networking/v2/apiversions/urls.go b/openstack/networking/v2/apiversions/urls.go
index e66434e..c43f991 100644
--- a/openstack/networking/v2/apiversions/urls.go
+++ b/openstack/networking/v2/apiversions/urls.go
@@ -6,10 +6,10 @@
 	"github.com/rackspace/gophercloud"
 )
 
-func APIVersionsURL(c *gophercloud.ServiceClient) string {
+func apiVersionsURL(c *gophercloud.ServiceClient) string {
 	return c.ServiceURL("")
 }
 
-func APIInfoURL(c *gophercloud.ServiceClient, version string) string {
+func apiInfoURL(c *gophercloud.ServiceClient, version string) string {
 	return c.ServiceURL(strings.TrimRight(version, "/") + "/")
 }
diff --git a/openstack/networking/v2/apiversions/urls_test.go b/openstack/networking/v2/apiversions/urls_test.go
index 383ba59..7dd069c 100644
--- a/openstack/networking/v2/apiversions/urls_test.go
+++ b/openstack/networking/v2/apiversions/urls_test.go
@@ -7,20 +7,20 @@
 	th "github.com/rackspace/gophercloud/testhelper"
 )
 
-const Endpoint = "http://localhost:57909/"
+const endpoint = "http://localhost:57909/"
 
-func EndpointClient() *gophercloud.ServiceClient {
-	return &gophercloud.ServiceClient{Endpoint: Endpoint}
+func endpointClient() *gophercloud.ServiceClient {
+	return &gophercloud.ServiceClient{Endpoint: endpoint}
 }
 
 func TestAPIVersionsURL(t *testing.T) {
-	actual := APIVersionsURL(EndpointClient())
-	expected := Endpoint
+	actual := apiVersionsURL(endpointClient())
+	expected := endpoint
 	th.AssertEquals(t, expected, actual)
 }
 
 func TestAPIInfoURL(t *testing.T) {
-	actual := APIInfoURL(EndpointClient(), "v2.0")
-	expected := Endpoint + "v2.0/"
+	actual := apiInfoURL(endpointClient(), "v2.0")
+	expected := endpoint + "v2.0/"
 	th.AssertEquals(t, expected, actual)
 }
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
diff --git a/openstack/networking/v2/extensions/requests.go b/openstack/networking/v2/extensions/requests.go
index 7120490..d24108e 100644
--- a/openstack/networking/v2/extensions/requests.go
+++ b/openstack/networking/v2/extensions/requests.go
@@ -6,9 +6,11 @@
 	"github.com/rackspace/gophercloud/pagination"
 )
 
-func Get(c *gophercloud.ServiceClient, name string) (*Extension, error) {
+// Get retrieves information for a specific extension using its alias. If no
+// extension exists with this alias, an error will be returned.
+func Get(c *gophercloud.ServiceClient, alias string) (*Extension, error) {
 	var ext Extension
-	_, err := perigee.Request("GET", ExtensionURL(c, name), perigee.Options{
+	_, err := perigee.Request("GET", extensionURL(c, alias), perigee.Options{
 		MoreHeaders: c.Provider.AuthenticatedHeaders(),
 		Results: &struct {
 			Extension *Extension `json:"extension"`
@@ -22,8 +24,10 @@
 	return &ext, nil
 }
 
+// List returns a Pager which allows you to iterate over the full collection of
+// extensions. It does not accept query parameters.
 func List(c *gophercloud.ServiceClient) pagination.Pager {
-	return pagination.NewPager(c, ListExtensionURL(c), func(r pagination.LastHTTPResponse) pagination.Page {
+	return pagination.NewPager(c, listExtensionURL(c), func(r pagination.LastHTTPResponse) pagination.Page {
 		return ExtensionPage{pagination.SinglePageBase(r)}
 	})
 }
diff --git a/openstack/networking/v2/extensions/results.go b/openstack/networking/v2/extensions/results.go
index c67bd01..42e7fc3 100644
--- a/openstack/networking/v2/extensions/results.go
+++ b/openstack/networking/v2/extensions/results.go
@@ -5,6 +5,7 @@
 	"github.com/rackspace/gophercloud/pagination"
 )
 
+// Extension is a struct that represents a Neutron extension.
 type Extension struct {
 	Updated     string        `json:"updated"`
 	Name        string        `json:"name"`
@@ -14,10 +15,13 @@
 	Description string        `json:"description"`
 }
 
+// ExtensionPage is the page returned by a pager when traversing over a
+// collection of extensions.
 type ExtensionPage struct {
 	pagination.SinglePageBase
 }
 
+// IsEmpty checks whether an ExtensionPage struct is empty.
 func (r ExtensionPage) IsEmpty() (bool, error) {
 	is, err := ExtractExtensions(r)
 	if err != nil {
@@ -26,6 +30,9 @@
 	return len(is) == 0, nil
 }
 
+// ExtractExtensions accepts a Page struct, specifically an ExtensionPage
+// struct, and extracts the elements into a slice of Extension structs. In other
+// words, a generic collection is mapped into a relevant slice.
 func ExtractExtensions(page pagination.Page) ([]Extension, error) {
 	var resp struct {
 		Extensions []Extension `mapstructure:"extensions"`
diff --git a/openstack/networking/v2/extensions/urls.go b/openstack/networking/v2/extensions/urls.go
index 608b25f..e31e76c 100644
--- a/openstack/networking/v2/extensions/urls.go
+++ b/openstack/networking/v2/extensions/urls.go
@@ -2,12 +2,12 @@
 
 import "github.com/rackspace/gophercloud"
 
-const Version = "v2.0"
+const version = "v2.0"
 
-func ExtensionURL(c *gophercloud.ServiceClient, name string) string {
-	return c.ServiceURL(Version, "extensions", name)
+func extensionURL(c *gophercloud.ServiceClient, name string) string {
+	return c.ServiceURL(version, "extensions", name)
 }
 
-func ListExtensionURL(c *gophercloud.ServiceClient) string {
-	return c.ServiceURL(Version, "extensions")
+func listExtensionURL(c *gophercloud.ServiceClient) string {
+	return c.ServiceURL(version, "extensions")
 }
diff --git a/openstack/networking/v2/extensions/urls_test.go b/openstack/networking/v2/extensions/urls_test.go
index 34731cd..2a1e6a1 100644
--- a/openstack/networking/v2/extensions/urls_test.go
+++ b/openstack/networking/v2/extensions/urls_test.go
@@ -7,20 +7,20 @@
 	th "github.com/rackspace/gophercloud/testhelper"
 )
 
-const Endpoint = "http://localhost:57909/"
+const endpoint = "http://localhost:57909/"
 
-func EndpointClient() *gophercloud.ServiceClient {
-	return &gophercloud.ServiceClient{Endpoint: Endpoint}
+func endpointClient() *gophercloud.ServiceClient {
+	return &gophercloud.ServiceClient{Endpoint: endpoint}
 }
 
 func TestExtensionURL(t *testing.T) {
-	actual := ExtensionURL(EndpointClient(), "agent")
-	expected := Endpoint + "v2.0/extensions/agent"
+	actual := extensionURL(endpointClient(), "agent")
+	expected := endpoint + "v2.0/extensions/agent"
 	th.AssertEquals(t, expected, actual)
 }
 
 func TestListExtensionURL(t *testing.T) {
-	actual := ListExtensionURL(EndpointClient())
-	expected := Endpoint + "v2.0/extensions"
+	actual := listExtensionURL(endpointClient())
+	expected := endpoint + "v2.0/extensions"
 	th.AssertEquals(t, expected, actual)
 }