Update data-flow-alter-row.md

Author: kromerm

articles/data-factory/data-flow-alter-row.md

@@ -9,7 +9,7 @@ ms.service: data-factory
 ms.subservice: data-flows
 ms.topic: conceptual
 ms.custom: synapse, ignite-2022
-ms.date: 08/03/2022
+ms.date: 11/01/2022
 ---
 
 # Alter row transformation in mapping data flow
@@ -26,6 +26,9 @@ Alter Row transformations only operate on database, REST, or Azure Cosmos DB sin
 
 > [!VIDEO https://www.microsoft.com/en-us/videoplayer/embed/RE4vJYc]
 
+> [!NOTE]
+> An Alter Row transformation is not needed for Change Data Capture data flows that use native CDC sources like SQL Server or SAP. In those instances, ADF will automatically detect the row marker so Alter Row policies are unnecessary.
+
 ## Specify a default row policy
 
 Create an Alter Row transformation and specify a row policy with a condition of `true()`. Each row that doesn't match any of the previously defined expressions will be marked for the specified row policy. By default, each row that doesn't match any conditional expression will be marked for `Insert`.