Finishing documentation
diff --git a/openstack/networking/v2/subnets/errors.go b/openstack/networking/v2/subnets/errors.go
index ca2df72..0db0a6e 100644
--- a/openstack/networking/v2/subnets/errors.go
+++ b/openstack/networking/v2/subnets/errors.go
@@ -7,9 +7,7 @@
 }
 
 var (
-	ErrNetworkIDRequired     = err("A network ID is required")
-	ErrCIDRRequired          = err("A valid CIDR is required")
-	ErrInvalidIPType         = err("An IP type must either be 4 or 6")
-	ErrCIDRNotUpdatable      = err("CIDR attributes cannot be updated")
-	ErrIPVersionNotUpdatable = err("IP Version attributes cannot be updated")
+	errNetworkIDRequired = err("A network ID is required")
+	errCIDRRequired      = err("A valid CIDR is required")
+	errInvalidIPType     = err("An IP type must either be 4 or 6")
 )