-This option is useful for transfer of large files with block-based change
-or appended data, and also on systems that are disk bound not network bound.
+This option is useful for transfer of large files with block-based changes
+or appended data, and also on systems that are disk bound, not network
+bound.
+
+The option implies --partial (since an interrupted transfer does not delete
+the file), but conflicts with --partial-dir, --compare-dest, and
+--link-dest (a future rsync version will hopefully update the protocol to
+remove these restrictions).