diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6449559a..3ab43847 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # HDMF-ZARR Changelog
 
-## 0.3.1 (Upcoming)
+## 0.4.0 (Upcoming)
 
 ### Enhancements
 * Enhanced ZarrIO to resolve object references lazily on read similar to HDMF's `HDF5IO` backend @mavaylon1 [#120](https://github.com/hdmf-dev/hdmf-zarr/pull/120)
diff --git a/src/hdmf_zarr/backend.py b/src/hdmf_zarr/backend.py
index 0b5a8f1a..688d387d 100644
--- a/src/hdmf_zarr/backend.py
+++ b/src/hdmf_zarr/backend.py
@@ -824,6 +824,11 @@ def write_dataset(self, **kwargs):  # noqa: C901
                 dset = self.__list_fill__(parent, name, data, options)
         # Write a dataset of references
         elif self.__is_ref(options['dtype']):
+            # TODO Region references are not yet support, but here how the code should look
+            #  if isinstance(data, RegionBuilder):
+            #      shape = (1,)
+            #      type_str = 'region'
+            #      refs = self.__get_ref(data.builder, data.region)
             if isinstance(data, ReferenceBuilder):
                 shape = (1,)
                 type_str = 'object'