:ref:`asyncio logger <asyncio-logger>`.
The debug flag changes the behaviour of the :func:`coroutine` decorator. The
-debug flag value is only when then coroutine function is defined, not when it
-is called. Coroutine functions defined before the debug flag is set to
+debug flag value is only used when then coroutine function is defined, not when
+it is called. Coroutine functions defined before the debug flag is set to
``True`` will not be tracked. For example, it is not possible to debug
coroutines defined in the :mod:`asyncio` module, because the module must be
imported before the flag value can be changed.