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README.md

@@ -281,7 +281,8 @@ Streams the source file to the worker's local `workDir`, verifies the byte count
 reports throttled copy progress, and retries failed writes twice after removing
 the partial destination. Its `Copy method` input defaults to `auto` (the
 operating system's native file-copy path) and offers `stream` as a fallback
-for problematic mounts. It stores the original library path in
+for problematic mounts. The stream fallback defaults to a 16 MB buffer and
+offers 4 MB or 64 MB alternatives. It stores the original library path in
 `variables.originalLibraryFile` for `replaceOriginalFile`.
 
 ### 9. `replaceOriginalFile` — Replace Original File