-===========================================
-memcached_touch, memcached_touch_by_key
-===========================================
+Update expiration on a key
+==========================
.. index:: object: memcached_st
:func:`memcached_touch_by_key` works the same, but it takes a master key
to find the given value.
-RETURN
-------
+RETURN VALUE
+------------
A value of type :type:`memcached_return_t` is returned
On success that value will be `MEMCACHED_SUCCESS`.