diff --git a/source/IncomingMessages.Domain/MeteredDataForMeasurementPointMessage.cs b/source/IncomingMessages.Domain/MeteredDataForMeasurementPointMessage.cs
index d5e1e01d8f..ebfd987352 100644
--- a/source/IncomingMessages.Domain/MeteredDataForMeasurementPointMessage.cs
+++ b/source/IncomingMessages.Domain/MeteredDataForMeasurementPointMessage.cs
@@ -39,6 +39,7 @@ public record MeteredDataForMeasurementPointSeries(
     string StartDateTime,
     string? EndDateTime,
     string? ProductNumber,
+    // This field is not used in Ebix
     string? RegisteredAt,
     string? ProductUnitType,
     string? MeteringPointType,