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diff --git a/Doc/library/gc.rst b/Doc/library/gc.rst
index 99504c6..7c425e3 100644
--- a/Doc/library/gc.rst
+++ b/Doc/library/gc.rst
@@ -44,6 +44,11 @@ The :mod:`gc` module provides the following functions:
:exc:`ValueError` is raised if the generation number is invalid. The number of
unreachable objects found is returned.
+ 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:`float`.
+
.. function:: set_debug(flags)