diff --git a/33128/r15/TS33128Payloads.asn b/33128/r15/TS33128Payloads.asn
index 59e0a0730ab802695401b5dc0026babdd2f916ce..14d0e2a3912bf7c3fc9324c8959d33c3f54c3557 100644
--- a/33128/r15/TS33128Payloads.asn
+++ b/33128/r15/TS33128Payloads.asn
@@ -69,9 +69,10 @@ XIRIEvent ::= CHOICE
 
 IRIPayload ::= SEQUENCE
 {
-    relativeOID         [1] RELATIVE-OID,
-    event               [2] IRIEvent,
-    targetIdentifiers   [3] SEQUENCE OF IRITargetIdentifier OPTIONAL
+    relativeOID              [1] RELATIVE-OID,
+    event                    [2] IRIEvent,
+    targetIdentifiers        [3] SEQUENCE OF IRITargetIdentifier OPTIONAL,
+    mediatedFromIndicator    [4] MediatedFromIndicator OPTIONAL
 }
 
 IRIEvent ::= CHOICE
@@ -113,6 +114,11 @@ IRITargetIdentifier ::= SEQUENCE
     provenance                                          [2] TargetIdentifierProvenance OPTIONAL
 }
 
+MediatedFromIndicator ::= CHOICE
+{
+    xIRIRelativeOID   [1] RELATIVE-OID
+}
+
 -- ==============
 -- HI3 CC payload
 -- ==============