diff --git a/docs/sphinx/source/conf.py b/docs/sphinx/source/conf.py
index 6ee5a5a1c3..157e77074a 100644
--- a/docs/sphinx/source/conf.py
+++ b/docs/sphinx/source/conf.py
@@ -56,11 +56,28 @@
     'sphinx_gallery.gen_gallery',
     'sphinx_toggleprompt',
     'sphinx_favicon',
+    'hoverxref.extension',
 ]
 
 mathjax3_config = {'chtml': {'displayAlign': 'left',
                              'displayIndent': '2em'}}
 
+# Example configuration for intersphinx: refer to the Python standard library.
+intersphinx_mapping = {
+    'python': ('https://docs.python.org/3/', None),
+    'numpy': ('https://numpy.org/doc/stable/', None),
+    'scipy': ('https://docs.scipy.org/doc/scipy/reference/', None),
+    'pandas': ('https://pandas.pydata.org/pandas-docs/stable', None),
+    'matplotlib': ('https://matplotlib.org/stable', None),
+}
+
+# Enable hover tooltips
+hoverxref_auto_ref = True
+hoverxref_roles = ["class", "meth", "func", "ref", "term"]
+hoverxref_role_types = dict.fromkeys(hoverxref_roles, "tooltip")
+hoverxref_domains = ["py"]
+hoverxref_intersphinx = list(intersphinx_mapping.keys())
+
 napoleon_use_rtype = False  # group rtype on same line together with return
 
 # Add any paths that contain templates here, relative to this directory.
@@ -357,15 +374,6 @@ def setup(app):
 # If true, do not generate a @detailmenu in the "Top" node's menu.
 # texinfo_no_detailmenu = False
 
-# Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {
-    'python': ('https://docs.python.org/3/', None),
-    'numpy': ('https://numpy.org/doc/stable/', None),
-    'scipy': ('https://docs.scipy.org/doc/scipy/reference/', None),
-    'pandas': ('https://pandas.pydata.org/pandas-docs/stable', None),
-    'matplotlib': ('https://matplotlib.org/stable', None),
-}
-
 ipython_warning_is_error = False
 
 # suppress "WARNING: Footnote [1] is not referenced." messages
diff --git a/pvlib/irradiance.py b/pvlib/irradiance.py
index 1a3ac5e71e..cecba6237b 100644
--- a/pvlib/irradiance.py
+++ b/pvlib/irradiance.py
@@ -244,7 +244,7 @@ def beam_component(surface_tilt, surface_azimuth, solar_zenith, solar_azimuth,
     solar_azimuth : numeric
         Solar azimuth angle.
     dni : numeric
-        Direct Normal Irradiance
+        Direct normal irradiance, see :term:`dni`. [Wm⁻²]
 
     Returns
     -------
diff --git a/pyproject.toml b/pyproject.toml
index f8283a42eb..8464b7ce23 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -66,6 +66,7 @@ doc = [
     'sphinx-toggleprompt == 0.5.2',
     'sphinx-favicon',
     'solarfactors',
+    'sphinx-hoverxref',
 ]
 test = [
     'pytest',