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