diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index e968c8f..7d7fc56 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -160,7 +160,7 @@
    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 77a8b83..e2e4b73 100644
--- a/Doc/c-api/float.rst
+++ b/Doc/c-api/float.rst
@@ -64,16 +64,16 @@
    around the header file :file:`float.h`.
 
 
-.. cfunction:: double PyFloat_GetMax(void)
+.. cfunction:: double PyFloat_GetMax()
 
    Return the maximum representable finite float *DBL_MAX* as C :ctype:`double`.
 
 
-.. cfunction:: double PyFloat_GetMin(void)
+.. cfunction:: double PyFloat_GetMin()
 
    Return the minimum normalized positive float *DBL_MIN* as C :ctype:`double`.
 
-.. 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/method.rst b/Doc/c-api/method.rst
index 9ee49ba..d8b2ed8 100644
--- a/Doc/c-api/method.rst
+++ b/Doc/c-api/method.rst
@@ -94,7 +94,7 @@
    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 15f1af4..adadfe5 100644
--- a/Doc/c-api/sys.rst
+++ b/Doc/c-api/sys.rst
@@ -73,7 +73,7 @@
    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 a66f043..c1f8e12 100644
--- a/Doc/c-api/tuple.rst
+++ b/Doc/c-api/tuple.rst
@@ -107,6 +107,6 @@
    raises :exc:`MemoryError` or :exc:`SystemError`.
 
 
-.. 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 07f82c9..d0edd55 100644
--- a/Doc/c-api/type.rst
+++ b/Doc/c-api/type.rst
@@ -33,7 +33,7 @@
    standard type object.  Return false in all other cases.
 
 
-.. 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 5b8b4e8..dc48158 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -84,10 +84,11 @@
    :ctype:`PyUnicodeObject` (not checked).
 
 
-.. cfunction:: int PyUnicode_ClearFreeList(void)
+.. cfunction:: int PyUnicode_ClearFreeList()
 
    Clear the free list. Return the total number of freed items.
 
+
 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.