diff --git a/doc/index.rst b/doc/index.rst
index 2c0b887..1a30988 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -32,6 +32,11 @@ need:
 * `matplotlib <https://matplotlib.org/>`_
 * `healpy <https://healpy.readthedocs.io/en/latest/>`_
 
+If you want to work with the dust utilities in :mod:`desiutil.dust`, you will
+need:
+
+* `SciPy <https://scipy.org>`
+
 Contents
 ========
 
diff --git a/setup.cfg b/setup.cfg
index 756a54c..d8995d4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -34,7 +34,6 @@ install_requires =
     requests
     pyyaml
     numpy<2.0
-    scipy
     astropy>=5.0
     healpy
     matplotlib
@@ -59,7 +58,9 @@ scripts =
 [options.extras_require]
 test =
     pytest
+    scipy
 coverage =
+    scipy
     pytest-cov
     coveralls
 doc =