diff --git a/README.md b/README.md
index d1aaaba..7d4a7af 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,8 @@ API calls.
     --overwrite-extract : allows overwriting when extracting
     --no-abs-symlink : do not store absolute paths for symlinks
     --temp-files-dir <dir> : where to store temporary files created when compressing (defaults to current working directory)
+    --write-version <version> : Force write version file format (default 1)
+    --chunk-min-size <bytes> : v1 file format minimum chunk size (default 4194304 or 4MiB)
     -- : specifies remaining arguments are files to archive/extract
     If creating archive file, remaining args specify files to archive.
     If extracting archive file, remaining args specify files to extract.