-/** No specific routing. Mainly useful with the constant network model */
-class XBT_PRIVATE AsNone : public AsImpl {
+/** @ingroup ROUTING_API
+ * @brief NetZone with no routing, useful with the constant network model
+ *
+ * Such netzones never contain any link, and the latency is always left unchanged:
+ * the constant time network model computes this latency externally.
+ */
+
+class XBT_PRIVATE EmptyZone : public NetZoneImpl {