diff --git a/doc/config.rst b/doc/config.rst
index 5e641cbfb..8c77ee2c6 100644
--- a/doc/config.rst
+++ b/doc/config.rst
@@ -50,6 +50,9 @@ Important points to note:
   Note that the current builder tag is not available in ``conf.py``, as it is
   created *after* the builder is initialized.
 
+.. seealso:: Additional configurations, such as adding stylesheets,
+   javascripts, builders, etc. can be made through the :doc:`/extdev/appapi`.
+
 
 General configuration
 ---------------------