diff --git a/Doc/c-api/float.rst b/Doc/c-api/float.rst
index b0647bc..8fff0d0 100644
--- a/Doc/c-api/float.rst
+++ b/Doc/c-api/float.rst
@@ -72,3 +72,9 @@
 .. cfunction:: double PyFloat_GetMin(void)
 
    Return the minimum normalized positive float *DBL_MIN* as C :ctype:`double`.
+
+.. cfunction:: void PyFloat_CompactFreeList(size_t *bc, size_t *bf, size_t *sum)
+
+   Compact the float free list. *bc* is the number of allocated blocks before
+   blocks are freed, *bf* is the number of freed blocks and *sum* is the number
+   of remaining objects in the blocks.
diff --git a/Doc/c-api/set.rst b/Doc/c-api/set.rst
index 83d9532..14d8eab 100644
--- a/Doc/c-api/set.rst
+++ b/Doc/c-api/set.rst
@@ -56,6 +56,13 @@
 
    .. versionadded:: 2.6
 
+.. cfunction:: int PyFrozenSet_Check(PyObject *p)
+
+   Return true if *p* is a :class:`frozenset` object or an instance of a
+   subtype.
+
+   .. versionadded:: 2.6
+
 .. cfunction:: int PyAnySet_Check(PyObject *p)
 
    Return true if *p* is a :class:`set` object, a :class:`frozenset` object, or an
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 5fdff44..02a1d20 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -54,9 +54,28 @@
    A string containing the copyright pertaining to the Python interpreter.
 
 
-.. function:: _cleartypecache()
+.. function:: _compact_freelists()
 
-   Clear the internal type lookup cache.
+   Compact the free list of floats by deallocating unused blocks.
+   It can reduce the memory usage of the Python process several tenth of
+   thousands of integers or floats have been allocated at once.
+
+   The return value is a tuple of tuples each containing three elements,
+   amount of used objects, total block count before the blocks are deallocated
+   and amount of freed blocks. 
+
+   This function should be used for specialized purposes only.
+
+   .. versionadded:: 2.6
+
+
+.. function:: _clear_type_cache()
+
+   Clear the internal type cache. The type cache is used to speed up attribute
+   and method lookups. Use the function *only* to drop unnecessary references
+   during reference leak debugging.
+
+   This function should be used for internal and specialized purposes only.
 
    .. versionadded:: 2.6