diff --git a/Doc/library/gc.rst b/Doc/library/gc.rst
index 0c33c86..2d85cd3 100644
--- a/Doc/library/gc.rst
+++ b/Doc/library/gc.rst
@@ -106,9 +106,9 @@
    allocations minus the number of deallocations exceeds *threshold0*, collection
    starts.  Initially only generation ``0`` is examined.  If generation ``0`` has
    been examined more than *threshold1* times since generation ``1`` has been
-   examined, then generation ``1`` is examined as well.  Similarly, *threshold2*
-   controls the number of collections of generation ``1`` before collecting
-   generation ``2``.
+   examined, then generation ``1`` is examined as well.
+   With the third generation, things are a bit more complicated,
+   see `Collecting the oldest generation <https://devguide.python.org/garbage_collector/#collecting-the-oldest-generation>`_ for more information.
 
 
 .. function:: get_count()