diff --git a/doc/development/builders.rst b/doc/development/builders.rst
index bb6777023..4f5b41f9c 100644
--- a/doc/development/builders.rst
+++ b/doc/development/builders.rst
@@ -10,23 +10,17 @@ Discover builders by entry point
 that they do not have to be listed in the :confval:`extensions` configuration
 value.
 
-Builder extensions should define an entry point in the ``sphinx.builders``
+Builder extensions should define an entry point in the ``"sphinx.builders"``
 group. The name of the entry point needs to match your builder's
 :attr:`~.Builder.name` attribute, which is the name passed to the
 :option:`sphinx-build -b` option. The entry point value should equal the
 dotted name of the extension module. Here is an example of how an entry point
-for 'mybuilder' can be defined in the extension's ``setup.py``
+for 'mybuilder' can be defined in the extension's ``pyproject.toml``
 
-.. code-block:: python
+.. code-block:: toml
 
-   setup(
-       # ...
-       entry_points={
-           'sphinx.builders': [
-               'mybuilder = my.extension.module',
-           ],
-       }
-   )
+   [project.entry-points."sphinx.builders"]
+   mybuilder = "my.extension.module"
 
 Note that it is still necessary to register the builder using
 :meth:`~.Sphinx.add_builder` in the extension's :func:`setup` function.
diff --git a/doc/development/theming.rst b/doc/development/theming.rst
index 538dcafa6..23f8992a7 100644
--- a/doc/development/theming.rst
+++ b/doc/development/theming.rst
@@ -95,21 +95,20 @@ As a way to distribute your theme, you can use a Python package.  This makes it
 easier for users to set up your theme.
 
 To distribute your theme as a Python package, please define an entry point
-called ``sphinx.html_themes`` in your ``setup.py`` file, and write a ``setup()``
-function to register your themes using ``add_html_theme()`` API in it::
+called ``sphinx.html_themes`` in your ``pyproject.toml`` file,
+and write a ``setup()`` function to register your theme
+using the :meth:`~sphinx.application.Sphinx.add_html_theme` API:
 
-    # 'setup.py'
-    setup(
-        ...
-        entry_points = {
-            'sphinx.html_themes': [
-                'name_of_theme = your_package',
-            ]
-        },
-        ...
-    )
+.. code-block:: toml
 
-    # 'your_package.py'
+   # pyproject.toml
+
+   [project.entry-points."sphinx.html_themes"]
+   name_of_theme = "your_theme_package"
+
+.. code-block:: python
+
+    # your_theme_package.py
     from os import path
 
     def setup(app):