diff --git a/docs/design_doc.md b/docs/design_doc.md
index a46d41f8..da2492cf 100644
--- a/docs/design_doc.md
+++ b/docs/design_doc.md
@@ -234,9 +234,9 @@ The requirements are the following:
 - The table MUST contains axis name to represent the axes.
     - If it's 2D, the axes should be `["x","y"]`.
     - If it's 3D, the axes should be `["x","y","z"]`.
-- It MUST also contains coordinates transformations in `dask.dataframe.DataFrame().attrs["transform"]`.
+- It MUST also contain coordinate transformations in `dask.dataframe.DataFrame().attrs["transform"]` (or on-disk in `.attrs["coordinateTransformations"]` for the Zarr Group containing the Element).
 
-Additional information is stored in `dask.dataframe.DataFrame().attrs["spatialdata_attrs"]`
+Additional information is stored in `dask.dataframe.DataFrame().attrs["spatialdata_attrs"]` (or on-disk in `.attrs["spatialdata_attrs"]` for the Zarr Group containing the Element).
 
 - It MAY also contains `"feature_key"`, that is, the column name of the table that refers to the features. This `Series` MAY be of type `pandas.Categorical`.
 - It MAY contains additional information in `dask.dataframe.DataFrame().attrs["spatialdata_attrs"]`, specifically: