diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
index 9c4777ac2fe..142e169b89c 100644
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -666,6 +666,12 @@ The module defines the following classes, functions and decorators:
 
    .. versionadded:: 3.6
 
+.. class:: AsyncContextManager(Generic[T_co])
+
+   A generic version of :class:`contextlib.AbstractAsyncContextManager`.
+
+   .. versionadded:: 3.6
+
 .. class:: Dict(dict, MutableMapping[KT, VT])
 
    A generic version of :class:`dict`.
diff --git a/Misc/NEWS.d/next/Documentation/2018-05-14-15-15-41.bpo-33421.3GU_QO.rst b/Misc/NEWS.d/next/Documentation/2018-05-14-15-15-41.bpo-33421.3GU_QO.rst
new file mode 100644
index 00000000000..75694b7be1e
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2018-05-14-15-15-41.bpo-33421.3GU_QO.rst
@@ -0,0 +1 @@
+Add missing documentation for ``typing.AsyncContextManager``.