named return vars
diff --git a/openstack/compute/v2/extensions/volumeattach/urls.go b/openstack/compute/v2/extensions/volumeattach/urls.go
index c60674a..083f8dc 100644
--- a/openstack/compute/v2/extensions/volumeattach/urls.go
+++ b/openstack/compute/v2/extensions/volumeattach/urls.go
@@ -4,22 +4,22 @@
 
 const resourcePath = "os-volume_attachments"
 
-func resourceURL(c *gophercloud.ServiceClient, serverId string) string {
-	return c.ServiceURL("servers", serverId, resourcePath)
+func resourceURL(c *gophercloud.ServiceClient, serverID string) string {
+	return c.ServiceURL("servers", serverID, resourcePath)
 }
 
-func listURL(c *gophercloud.ServiceClient, serverId string) string {
-	return resourceURL(c, serverId)
+func listURL(c *gophercloud.ServiceClient, serverID string) string {
+	return resourceURL(c, serverID)
 }
 
-func createURL(c *gophercloud.ServiceClient, serverId string) string {
-	return resourceURL(c, serverId)
+func createURL(c *gophercloud.ServiceClient, serverID string) string {
+	return resourceURL(c, serverID)
 }
 
-func getURL(c *gophercloud.ServiceClient, serverId, aId string) string {
-	return c.ServiceURL("servers", serverId, resourcePath, aId)
+func getURL(c *gophercloud.ServiceClient, serverID, aID string) string {
+	return c.ServiceURL("servers", serverID, resourcePath, aID)
 }
 
-func deleteURL(c *gophercloud.ServiceClient, serverId, aId string) string {
-	return getURL(c, serverId, aId)
+func deleteURL(c *gophercloud.ServiceClient, serverID, aID string) string {
+	return getURL(c, serverID, aID)
 }