diff --git a/src/bacnet/bacenum.h b/src/bacnet/bacenum.h
index 345c5902..09dbdb60 100644
--- a/src/bacnet/bacenum.h
+++ b/src/bacnet/bacenum.h
@@ -454,7 +454,7 @@ typedef enum {
     PROP_NETWORK_TYPE = 427,
     PROP_ROUTING_TABLE = 428,
     PROP_VIRTUAL_MAC_ADDRESS_TABLE = 429,
-    /* enumerations 430-491 */
+    /* enumerations 430-491 are defined in Addendum-135-2012as */
     PROP_COMMAND_TIME_ARRAY = 430,
     PROP_CURRENT_COMMAND_PRIORITY = 431,
     PROP_LAST_COMMAND_TIME = 432,
@@ -1497,6 +1497,8 @@ typedef enum BACnet_Unconfirmed_Service_Choice {
     SERVICE_UNCONFIRMED_WRITE_GROUP = 10,
     /* addendum 2012-aq */
     SERVICE_UNCONFIRMED_COV_NOTIFICATION_MULTIPLE = 11,
+    /* addendum 2016-bi */
+    SERVICE_UNCONFIRMED_AUDIT_NOTIFICATION = 12,
     /* addendum 2016-bz */
     SERVICE_UNCONFIRMED_WHO_AM_I = 13,
     SERVICE_UNCONFIRMED_YOU_ARE = 14,
@@ -1552,9 +1554,9 @@ typedef enum BACnet_Services_Supported {
     /* Security Services */
     SERVICE_SUPPORTED_AUTHENTICATE = 24,
     SERVICE_SUPPORTED_REQUEST_KEY = 25,
+    /* Unconfirmed Services */
     SERVICE_SUPPORTED_I_AM = 26,
     SERVICE_SUPPORTED_I_HAVE = 27,
-    /* Unconfirmed Services */
     SERVICE_SUPPORTED_UNCONFIRMED_COV_NOTIFICATION = 28,
     SERVICE_SUPPORTED_UNCONFIRMED_COV_NOTIFICATION_MULTIPLE = 43,
     SERVICE_SUPPORTED_UNCONFIRMED_EVENT_NOTIFICATION = 29,