diff --git a/33128/r17/TS33128Payloads.asn b/33128/r17/TS33128Payloads.asn
index e4dd004defd16fb2c548a8a056d214ec50ee6b5a..e4a1a37f6c4460d6f3f8cfbb0e2929af8335374f 100644
--- a/33128/r17/TS33128Payloads.asn
+++ b/33128/r17/TS33128Payloads.asn
@@ -210,9 +210,10 @@ XIRIEvent ::= CHOICE
 
 IRIPayload ::= SEQUENCE
 {
-    iRIPayloadOID       [1] RELATIVE-OID,
-    event               [2] IRIEvent,
-    targetIdentifiers   [3] SEQUENCE OF IRITargetIdentifier OPTIONAL
+    iRIPayloadOID         [1] RELATIVE-OID,
+    event                 [2] IRIEvent,
+    targetIdentifiers     [3] SEQUENCE OF IRITargetIdentifier OPTIONAL,
+    mediatedFromIndicator [4] MediatedFromIndicator OPTIONAL
 }
 
 IRIEvent ::= CHOICE
@@ -392,6 +393,11 @@ IRITargetIdentifier ::= SEQUENCE
     provenance                                          [2] TargetIdentifierProvenance OPTIONAL
 }
 
+MediatedFromIndicator ::= CHOICE
+{
+    xIRIRelativeOID   [1] RELATIVE-OID
+}
+
 -- ==============
 -- HI3 CC payload
 -- ==============