Update xarray/backends/zarr.py

Co-authored-by: Maximilian Roos <[email protected]>

Author: dcherian

xarray/backends/zarr.py

@@ -52,7 +52,7 @@ def initialize_zarr(
 
     This function initializes a Zarr store with metadata that describes the entire datasets.
     If ``region_dims`` is specified, it will also
-    1. Write variables that don't contain any of ``region_dims``, and
+    1. Write variables that don't contain any of ``region_dims`` & indexes on the ``region_dims``, and
     2. Return a dataset with variables that do contain one or more of ``region_dims``.
        This dataset can be used for region writes in parallel.