diff --git a/102232-1/LI-PS-PDU.asn b/102232-1/LI-PS-PDU.asn
index c85780833ebbe414989464aae34003e9ff785326..2ed61ddbcc0e805927069a86d5e4a9885e59fc9e 100644
--- a/102232-1/LI-PS-PDU.asn
+++ b/102232-1/LI-PS-PDU.asn
@@ -242,7 +242,9 @@ PSHeader ::= SEQUENCE
 	interceptionPointID				[6] PrintableString (SIZE (1..8)) OPTIONAL,
 		-- see clause 5.2.11
 	microSecondTimeStamp			[7] MicroSecondTimeStamp OPTIONAL,
-	timeStampQualifier				[8] TimeStampQualifier OPTIONAL
+	timeStampQualifier				[8] TimeStampQualifier OPTIONAL,
+	networkFunctionIdentifier		[9] OCTET STRING (SIZE (1.. 65535)) OPTIONAL
+		-- see clause 5.2.X
 }
 
 Payload ::= CHOICE