#4427: fix arguments for "y" BuildValue type.
diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index d64cc5c..e90ac39 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -438,7 +438,7 @@
       Convert a C string and its length to a Python object.  If the C string pointer
       is *NULL*, the length is ignored and ``None`` is returned.
 
-   ``y`` (bytes) [char \*, int]
+   ``y`` (bytes) [char \*]
       This converts a C string to a Python :func:`bytes` object.  If the C
       string pointer is *NULL*, ``None`` is returned.