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@@ -1478,9 +1478,10 @@ always available.
    function to be used for the new scope, or ``None`` if the scope shouldn't be
    traced.
 
-   The local trace function should return a reference to itself (or to another
-   function for further tracing in that scope), or ``None`` to turn off tracing
-   in that scope.
+   The local trace function can return a reference to another function for
+   further tracing in that scope, or ``None`` to keep the current local trace
+   function active. To turn off tracing in this scope, the local trace function
+   can set ``frame.f_trace`` to ``None``.
 
    If there is any error occurred in the trace function, it will be unset, just
    like ``settrace(None)`` is called.