diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index ef4176a..22c0454 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1466,7 +1466,8 @@ are always available.  They are listed here in alphabetical order.
    Objects such as modules and instances have an updateable :attr:`__dict__`
    attribute; however, other objects may have write restrictions on their
    :attr:`__dict__` attributes (for example, classes use a
-   dictproxy to prevent direct dictionary updates).
+   :class:`dictproxy <types.MappingProxyType>` to prevent direct dictionary
+   updates).
 
    Without an argument, :func:`vars` acts like :func:`locals`.  Note, the
    locals dictionary is only useful for reads since updates to the locals