-Note that rsync always uses a whole-file checksum to verify that each
-transferred file was reconstructed correctly, irrespective of this or
-any other option's setting.
+Note that rsync always verifies that each em(transferred) file was
+correctly reconstructed on the receiving side using a whole-file checksum,
+but that after-transfer check has nothing to do with this option's
+before-transfer "Does the file need to be updated?" check.