diff --git a/docs/contextlib2.rst b/docs/contextlib2.rst
index 45d218a..0a8fbb3 100644
--- a/docs/contextlib2.rst
+++ b/docs/contextlib2.rst
@@ -616,6 +616,7 @@ Functions and classes provided:
    instead.
 
    .. method:: enter_async_context(cm)
+      :async:
 
       Similar to :meth:`ExitStack.enter_context` but expects an asynchronous context
       manager.
@@ -635,6 +636,7 @@ Functions and classes provided:
       Similar to :meth:`ExitStack.callback` but expects a coroutine function.
 
    .. method:: aclose()
+      :async:
 
       Similar to :meth:`ExitStack.close` but properly handles awaitables.