Dont put "void" in signature for nullary functions.
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.