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+Developing extensions overview
+==============================
+
+This page contains general information about developing Sphinx extensions.
+
+Make an extension depend on another extension
+---------------------------------------------
+
+Sometimes your extension depends on the functionality of another
+Sphinx extension. Most Sphinx extensions are activated in a
+project's :file:`conf.py` file, but this is not available to you as an
+extension developer.
+
+.. module:: sphinx.application
+   :no-index:
+
+To ensure that another extension is activated as a part of your own extension,
+use the :meth:`sphinx.application.Sphinx.setup_extension` method. This will
+activate another extension at run-time, ensuring that you have access to its
+functionality.
+
+For example, the following code activates the ``recommonmark`` extension:
+
+.. code-block:: python
+
+    def setup(app):
+        app.setup_extension("recommonmark")
+
+.. note::
+
+   Since your extension will depend on another, make sure to include
+   it as a part of your extension's installation requirements.