diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index d64cc5c3abc..e90ac3972b5 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -438,7 +438,7 @@ and the following format units are left untouched.
       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.