Update ingest-data-iot-hub.md

Author: TzviaGT

articles/data-explorer/ingest-data-iot-hub.md

@@ -77,7 +77,7 @@ Now you connect to the IoT Hub from Azure Data Explorer. When this connection is
     | IoT Hub | IoT Hub name |
     | Shared access policy | The name of the shared access policy. Must have read permissions |
     | Consumer group |  The consumer group defined in the IoT Hub built-in endpoint |
-	| Event system properties | The IoT Hub event system properties |
+	| Event system properties | The IoT Hub event system properties.in case that there are multiple records per event message, the system properties will be added to the first one |
     | | 
 
     > [!NOTE]