diff --git a/docs/changelog.rst b/docs/changelog.rst
index 5d11fc145a..b267e248ac 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -164,6 +164,8 @@ For packagers:
 
 Other changes:
 
+* Add ``sphinx`` and ``sphinx_rtd_theme`` as dependencies for a new ``docs`` extra
+  :bug:`4643`
 * :doc:`/plugins/absubmit`: Deprecate the ``absubmit`` plugin since
   AcousticBrainz has stopped accepting new submissions.
   :bug:`4627`
diff --git a/setup.py b/setup.py
index 459969f8e7..185f4f752e 100755
--- a/setup.py
+++ b/setup.py
@@ -128,6 +128,10 @@ def build_manpages():
             'types-requests',
             'types-Flask-Cors',
         ],
+        'docs': [
+            'sphinx',
+            'sphinx_rtd_theme',
+        ],
 
         # Plugin (optional) dependencies:
         'absubmit': ['requests'],