update docs

docs/datastores/builders.rst

@@ -12,7 +12,7 @@ The access-nri-intake package is installed in the :code:`hh5` and :code:`xp65` a
 users can install it into their own environment (see :ref:`installation` for details). The Builders can be 
 imported from the :code:`access_nri_intake.source.builders` submodule.
 
-There are currently three Builders available. Their core public APIs are given below (their full APIs can be 
+There are currently four Builders available. Their core public APIs are given below (their full APIs can be
 found in :ref:`source_api`).
 
 .. note::
@@ -39,8 +39,15 @@ ACCESS-CM2 output: :code:`AccessCm2Builder`
    :special-members: __init__, build, save
    :noindex:
 
+ACCESS-OM3 output: :code:`AccessOm3Builder`
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. autoclass:: access_nri_intake.source.builders.AccessOm3Builder
+   :special-members: __init__, build, save
+   :noindex:
+
 .. note::
 
    If you have ACCESS model output that isn't compatible with the existing set of Builders, check out the
    :ref:`builder_create` section or open an issue 
-   `here <https://github.com/ACCESS-NRI/access-nri-intake-catalog/issues/new/choose>`_.
+   `here <https://github.com/ACCESS-NRI/access-nri-intake-catalog/issues/new/choose>`_.