-#define SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3
-#define SUBTLV_EXT_IS_REACH_LINK_LOCAL_ID 4
-#define SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5
-#define SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6
-#define SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8
-#define SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9
-#define SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10
-#define SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11
-#define SUBTLV_EXT_IS_REACH_TE_METRIC 18
-#define SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20
-#define SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21
+#define SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* draft-ietf-isis-gmpls-extensions */
+#define SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */
+#define SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* draft-ietf-isis-gmpls-extensions */