diff --git a/CORE_TEAM_GUIDE.md b/CORE_TEAM_GUIDE.md
index 93055153e96..93c7b2092fe 100644
--- a/CORE_TEAM_GUIDE.md
+++ b/CORE_TEAM_GUIDE.md
@@ -272,6 +272,7 @@ resources such as:
 - [`pre-commit`](https://pre-commit.com) hooks for autoformatting.
 - [`ruff`](https://github.com/astral-sh/ruff) autoformatting and linting.
 - [python-xarray](https://stackoverflow.com/questions/tagged/python-xarray) on Stack Overflow.
+- The Xarray channel in the [OSSci Zulip](https://ossci.zulipchat.com/)
 - [@xarray_dev](https://x.com/xarray_dev) on X.
 - [xarray-dev](https://discord.gg/bsSGdwBn) discord community (normally only used for remote synchronous chat during sprints).
 
diff --git a/doc/conf.py b/doc/conf.py
index c80b4e458b6..df8e8f90c8a 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -233,6 +233,7 @@
     "header_links_before_dropdown": 8,
     "navbar_align": "left",
     "footer_center":["last-updated"],
+    "announcement": "Xarray now has a home in the <a href='https://ossci.zulipchat.com/'>OSSci Zulip</a>! Chat here with other devs, users, and our friends at Zarr.", # TODO: Remove a couple months'ish after 21 March 2026
     # Instead of adding these to the header bar they are linked in 'getting help' and 'contributing'
     # "icon_links": [
     # {
diff --git a/doc/contribute/contributing.rst b/doc/contribute/contributing.rst
index b565680af2e..654f8e3cc8a 100644
--- a/doc/contribute/contributing.rst
+++ b/doc/contribute/contributing.rst
@@ -18,8 +18,8 @@ All contributions, including bug reports, bug fixes, documentation improvements,
 and other ideas are welcome.
 
 If you have any questions on the process or how to fix something feel free to ask us!
-The recommended place to ask a question is  on `GitHub Discussions <https://github.com/pydata/xarray/discussions>`_
-, but we also have a `Discord <https://discord.com/invite/wEKPCt4PDu>`_ and a
+The recommended places to ask questions are `GitHub Discussions <https://github.com/pydata/xarray/discussions>`_
+or the Xarray channel in the `OSSci Zulip <https://ossci.zulipchat.com/#narrow/channel/582428-Xarray>`_. We also have a `Discord <https://discord.com/invite/wEKPCt4PDu>`_ and a
 `mailing list <https://groups.google.com/g/xarray>`_. There is also a
 `"python-xarray" tag on Stack Overflow <https://stackoverflow.com/questions/tagged/python-xarray>`_ which we monitor for questions.
 
diff --git a/xarray/core/indexes.py b/xarray/core/indexes.py
index d06951bd527..46276029ddc 100644
--- a/xarray/core/indexes.py
+++ b/xarray/core/indexes.py
@@ -83,6 +83,10 @@ def from_variables(
         variables : dict-like
             Mapping of :py:class:`Variable` objects holding the coordinate labels
             to index.
+        options : dict-like
+            Keyword arguments passed to this constructor. Propagated from
+            the ``**options`` argument of :py:meth:`xarray.DataArray.set_xindex`
+            or :py:meth:`xarray.Dataset.set_xindex`.
 
         Returns
         -------