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diff --git a/Doc/library/gc.rst b/Doc/library/gc.rst
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+++ b/Doc/library/gc.rst
@@ -47,6 +47,12 @@ The :mod:`gc` module provides the following functions:
.. versionchanged:: 2.5
The optional *generation* argument was added.
+ .. versionchanged:: 2.6
+ The free lists maintained for a number of builtin types are cleared
+ whenever a full collection or collection of the highest generation (2)
+ is run. Not all items in some free lists may be freed due to the
+ particular implementation, in particular :class:`int` and :class:`float`.
+
.. function:: set_debug(flags)