Update instance/associate with config group
diff --git a/rackspace/db/v1/instances/urls.go b/rackspace/db/v1/instances/urls.go
index c0c1bad..12f8d83 100644
--- a/rackspace/db/v1/instances/urls.go
+++ b/rackspace/db/v1/instances/urls.go
@@ -10,6 +10,10 @@
 	return baseURL(c)
 }
 
-func configURL(c *gophercloud.ServiceClient) string {
+func resourceURL(c *gophercloud.ServiceClient, id string) string {
+	return c.ServiceURL("instances", id)
+}
+
+func configURL(c *gophercloud.ServiceClient, id string) string {
 	return c.ServiceURL("instances", id, "configuration")
 }