diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index f34e4b4..4774861 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -136,7 +136,7 @@
    In both cases, *\*buffer_length* is set to the length of the encoded data
    without the trailing NUL byte.
 
-``et#`` (string, Unicode object or character buffer compatible object) [const char \*encoding, char \*\*buffer]
+``et#`` (string, Unicode object or character buffer compatible object) [const char \*encoding, char \*\*buffer, int \*buffer_length]
    Same as ``es#`` except that string objects are passed through without
    recoding them. Instead, the implementation assumes that the string object
    uses the encoding passed in as parameter.
diff --git a/Doc/c-api/float.rst b/Doc/c-api/float.rst
index f705297..c4099a3 100644
--- a/Doc/c-api/float.rst
+++ b/Doc/c-api/float.rst
@@ -72,21 +72,21 @@
    .. versionadded:: 2.6
 
 
-.. cfunction:: double PyFloat_GetMax(void)
+.. cfunction:: double PyFloat_GetMax()
 
    Return the maximum representable finite float *DBL_MAX* as C :ctype:`double`.
 
    .. versionadded:: 2.6
 
 
-.. cfunction:: double PyFloat_GetMin(void)
+.. cfunction:: double PyFloat_GetMin()
 
    Return the minimum normalized positive float *DBL_MIN* as C :ctype:`double`.
 
    .. versionadded:: 2.6
 
 
-.. cfunction:: int PyFloat_ClearFreeList(void)
+.. cfunction:: int PyFloat_ClearFreeList()
 
    Clear the float free list. Return the number of items that could not
    be freed.
diff --git a/Doc/c-api/int.rst b/Doc/c-api/int.rst
index 9ff0347..c561bc2 100644
--- a/Doc/c-api/int.rst
+++ b/Doc/c-api/int.rst
@@ -131,7 +131,7 @@
    (:const:`LONG_MAX`, as defined in the system header files).
 
 
-.. cfunction:: int PyInt_ClearFreeList(void)
+.. cfunction:: int PyInt_ClearFreeList()
 
    Clear the integer free list. Return the number of items that could not
    be freed.
diff --git a/Doc/c-api/method.rst b/Doc/c-api/method.rst
index c104f89..add1f0f 100644
--- a/Doc/c-api/method.rst
+++ b/Doc/c-api/method.rst
@@ -65,7 +65,7 @@
    Macro version of :cfunc:`PyMethod_Self` which avoids error checking.
 
 
-.. cfunction:: int PyMethod_ClearFreeList(void)
+.. cfunction:: int PyMethod_ClearFreeList()
 
    Clear the free list. Return the total number of freed items.
 
diff --git a/Doc/c-api/sys.rst b/Doc/c-api/sys.rst
index 7696811..f46fb9a 100644
--- a/Doc/c-api/sys.rst
+++ b/Doc/c-api/sys.rst
@@ -80,7 +80,7 @@
    case *name* is deleted from the sys module. Returns ``0`` on success, ``-1``
    on error.
 
-.. cfunction:: void PySys_ResetWarnOptions(void)
+.. cfunction:: void PySys_ResetWarnOptions()
 
    Reset :data:`sys.warnoptions` to an empty list.
 
diff --git a/Doc/c-api/tuple.rst b/Doc/c-api/tuple.rst
index 53db2a1..eb479d5 100644
--- a/Doc/c-api/tuple.rst
+++ b/Doc/c-api/tuple.rst
@@ -157,7 +157,7 @@
       require changes in your code for properly supporting 64-bit systems.
 
 
-.. cfunction:: int PyTuple_ClearFreeList(void)
+.. cfunction:: int PyTuple_ClearFreeList()
 
    Clear the free list. Return the total number of freed items.
 
diff --git a/Doc/c-api/type.rst b/Doc/c-api/type.rst
index 77a3aec..7d1c773 100644
--- a/Doc/c-api/type.rst
+++ b/Doc/c-api/type.rst
@@ -35,7 +35,7 @@
    .. versionadded:: 2.2
 
 
-.. cfunction:: unsigned int PyType_ClearCache(void)
+.. cfunction:: unsigned int PyType_ClearCache()
 
    Clear the internal lookup cache. Return the current version tag.
 
diff --git a/Doc/c-api/unicode.rst b/Doc/c-api/unicode.rst
index 8469ff9..b603734 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -98,12 +98,13 @@
    :ctype:`PyUnicodeObject` (not checked).
 
 
-.. cfunction:: int PyUnicode_ClearFreeList(void)
+.. cfunction:: int PyUnicode_ClearFreeList()
 
    Clear the free list. Return the total number of freed items.
 
    .. versionadded:: 2.6
 
+
 Unicode provides many different character properties. The most often needed ones
 are available through these macros which are mapped to C functions depending on
 the Python configuration.