Rackspace Auto Scale: Add webhooks Update()
diff --git a/rackspace/autoscale/v1/webhooks/urls.go b/rackspace/autoscale/v1/webhooks/urls.go
index d5b7dcb..0efb90f 100644
--- a/rackspace/autoscale/v1/webhooks/urls.go
+++ b/rackspace/autoscale/v1/webhooks/urls.go
@@ -13,3 +13,7 @@
 func getURL(c *gophercloud.ServiceClient, groupID, policyID, webhookID string) string {
 	return c.ServiceURL("groups", groupID, "policies", policyID, "webhooks", webhookID)
 }
+
+func updateURL(c *gophercloud.ServiceClient, groupID, policyID, webhookID string) string {
+	return getURL(c, groupID, policyID, webhookID)
+}