diff --git a/doc/index.rst b/doc/index.rst
index dd49636cdcd335a91889bff58318a5ed1b295ea2..2ff98d800e9959b210b874571db3dd7baef8c230 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -4,7 +4,23 @@
 
 
 The ``fslpy`` package is a collection of utilities and data abstractions used
-by |fsleyes_apidoc|_.
+within `FSL <https://fsl.fmrib.ox.ac.uk/fsl/fslwiki>`_ and by
+|fsleyes_apidoc|_.
+
+
+The top-level Python package for ``fslpy`` is called ``fsl``.  It is broadly
+split into the following sub-packages:
+
+
+.. autosummary::
+
+   fsl.data
+   fsl.utils
+   fsl.scripts
+   fsl.transform
+   fsl.version
+   fsl.wrappers
+
 
 .. toctree::
    :hidden: