diff -r 2e59e0b579e5 Doc/library/asyncio-task.rst
--- a/Doc/library/asyncio-task.rst	Wed May 28 18:50:12 2014 +0300
+++ b/Doc/library/asyncio-task.rst	Thu May 29 12:04:41 2014 +0700
@@ -315,7 +315,7 @@
 
       ``None`` is returned when called not in the context of a :class:`Task`.
 
-   .. method:: get_stack(self, \*, limit=None)
+   .. method:: get_stack(\*, limit=None)
 
       Return the list of stack frames for this task's coroutine.
 
@@ -344,6 +344,27 @@
       get_stack().  The file argument is an I/O stream to which the output
       goes; by default it goes to sys.stderr.
 
+   .. method:: cancel()
+
+      Request that a task to cancel itself.
+
+      This arranges for a CancellationError to be thrown into the
+      wrapped coroutine on the next cycle through the event loop.
+      The coroutine then has a chance to clean up or even deny
+      the request using try/except/finally.
+
+      Contrary to Future.cancel(), this does not guarantee that the
+      task will be cancelled: the exception might be caught and
+      acted upon, delaying cancellation of the task or preventing it
+      completely.  The task may also return a value or raise a
+      different exception.
+
+      Immediately after this method is called, Task.cancelled() will
+      not return True (unless the task was already cancelled).  A
+      task will be marked as cancelled when the wrapped coroutine
+      terminates with a CancelledError exception (even if cancel()
+      was not called).
+
 
 Example: Parallel execution of tasks
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^