diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index 79c9516cda2d60b..d9d421d7a8f5c32 100644
--- a/Doc/library/asyncio-eventloop.rst
+++ b/Doc/library/asyncio-eventloop.rst
@@ -1917,6 +1917,17 @@ By default asyncio is configured to use :class:`EventLoop`.
    methods that an alternative implementation of ``AbstractEventLoop``
    should have defined.
 
+.. class:: BaseEventLoop
+
+   A base class that partially implements :class:`AbstractEventLoop`
+   to simplify writing custom event loops.
+
+   It provides default implementations of many :class:`AbstractEventLoop`
+   methods, so subclasses have fewer methods to implement themselves.
+   In return, a subclass is expected to implement a number of internal,
+   protected methods.
+   See :ref:`writing_custom_event_loop` for more information.
+
 
 Examples
 ========
diff --git a/Doc/library/asyncio-extending.rst b/Doc/library/asyncio-extending.rst
index e7b293f484f8de6..0be79359b75e32b 100644
--- a/Doc/library/asyncio-extending.rst
+++ b/Doc/library/asyncio-extending.rst
@@ -12,14 +12,17 @@ classes. Asyncio has helpers that could be used to simplify this task.
 
    Third-parties should reuse existing asyncio code with caution,
    a new Python version is free to break backward compatibility
-   in *internal* part of API.
+   in the *internal* part of the API.
 
 
-Writing a Custom Event Loop
+.. _writing_custom_event_loop:
+
+Writing a custom event loop
 ===========================
 
-:class:`asyncio.AbstractEventLoop` declares very many methods.  Implementing all them
-from scratch is a tedious job.
+:class:`asyncio.AbstractEventLoop` declares very many methods.
+See :ref:`asyncio-event-loop-methods` for the full list.
+Implementing them all from scratch is a tedious job.
 
 A loop can get many common methods implementation for free by inheriting from
 :class:`asyncio.BaseEventLoop`.
diff --git a/Doc/tools/.nitignore b/Doc/tools/.nitignore
index 2255c745c003838..8845bfb143d8085 100644
--- a/Doc/tools/.nitignore
+++ b/Doc/tools/.nitignore
@@ -6,7 +6,6 @@ Doc/c-api/init_config.rst
 Doc/c-api/intro.rst
 Doc/c-api/stable.rst
 Doc/library/ast.rst
-Doc/library/asyncio-extending.rst
 Doc/library/email.charset.rst
 Doc/library/email.parser.rst
 Doc/library/http.cookiejar.rst