diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index fa6a296..83bbb70 100644
--- a/Doc/library/asyncio-eventloop.rst
+++ b/Doc/library/asyncio-eventloop.rst
@@ -5,6 +5,8 @@
 Base Event Loop
 ===============
 
+**Source code:** :source:`Lib/asyncio/events.py`
+
 The event loop is the central execution device provided by :mod:`asyncio`.
 It provides multiple facilities, including:
 
diff --git a/Doc/library/asyncio-eventloops.rst b/Doc/library/asyncio-eventloops.rst
index 1dc18fc..d74fcb1 100644
--- a/Doc/library/asyncio-eventloops.rst
+++ b/Doc/library/asyncio-eventloops.rst
@@ -3,6 +3,8 @@
 Event loops
 ===========
 
+**Source code:** :source:`Lib/asyncio/events.py`
+
 Event loop functions
 --------------------
 
diff --git a/Doc/library/asyncio-protocol.rst b/Doc/library/asyncio-protocol.rst
index dfe37c2..cd84ae7 100644
--- a/Doc/library/asyncio-protocol.rst
+++ b/Doc/library/asyncio-protocol.rst
@@ -1,8 +1,12 @@
 .. currentmodule:: asyncio
 
-++++++++++++++++++++++++++++++++++++++++++++++
-Transports  and protocols (callback based API)
-++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++
+Transports and protocols (callback based API)
++++++++++++++++++++++++++++++++++++++++++++++
+
+**Source code:** :source:`Lib/asyncio/transports.py`
+
+**Source code:** :source:`Lib/asyncio/protocols.py`
 
 .. _asyncio-transport:
 
diff --git a/Doc/library/asyncio-queue.rst b/Doc/library/asyncio-queue.rst
index f11c09a..ea78755 100644
--- a/Doc/library/asyncio-queue.rst
+++ b/Doc/library/asyncio-queue.rst
@@ -3,6 +3,8 @@
 Queues
 ======
 
+**Source code:** :source:`Lib/asyncio/queues.py`
+
 Queues:
 
 * :class:`Queue`
diff --git a/Doc/library/asyncio-stream.rst b/Doc/library/asyncio-stream.rst
index 6177b4b..491afdd 100644
--- a/Doc/library/asyncio-stream.rst
+++ b/Doc/library/asyncio-stream.rst
@@ -6,6 +6,8 @@
 Streams (coroutine based API)
 +++++++++++++++++++++++++++++
 
+**Source code:** :source:`Lib/asyncio/streams.py`
+
 Stream functions
 ================
 
diff --git a/Doc/library/asyncio-subprocess.rst b/Doc/library/asyncio-subprocess.rst
index 16ba9a3..1c1d0be 100644
--- a/Doc/library/asyncio-subprocess.rst
+++ b/Doc/library/asyncio-subprocess.rst
@@ -5,6 +5,8 @@
 Subprocess
 ==========
 
+**Source code:** :source:`Lib/asyncio/subprocess.py`
+
 Windows event loop
 ------------------
 
diff --git a/Doc/library/asyncio-sync.rst b/Doc/library/asyncio-sync.rst
index 0909352..14e3def 100644
--- a/Doc/library/asyncio-sync.rst
+++ b/Doc/library/asyncio-sync.rst
@@ -4,6 +4,8 @@
 Synchronization primitives
 ==========================
 
+**Source code:** :source:`Lib/asyncio/locks.py`
+
 Locks:
 
 * :class:`Lock`
diff --git a/Doc/library/asyncio-task.rst b/Doc/library/asyncio-task.rst
index 804f192..5298c11 100644
--- a/Doc/library/asyncio-task.rst
+++ b/Doc/library/asyncio-task.rst
@@ -3,6 +3,10 @@
 Tasks and coroutines
 ====================
 
+**Source code:** :source:`Lib/asyncio/tasks.py`
+
+**Source code:** :source:`Lib/asyncio/coroutines.py`
+
 .. _coroutine:
 
 Coroutines