diff --git a/src/omero_zarr/cli.py b/src/omero_zarr/cli.py
index 5f84d81..c855d8a 100644
--- a/src/omero_zarr/cli.py
+++ b/src/omero_zarr/cli.py
@@ -283,7 +283,7 @@ def _configure(self, parser: Parser) -> None:
             default="id",
             choices=["id", "name"],
             help=(
-                "How to name the Image or Plate zarr. Default 'id' is [ID].zarr. "
+                "How to name the Image or Plate zarr. Default 'id' is [ID].ome.zarr. "
                 "'name' is [NAME].ome.zarr"
             ),
         )