diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index c4588f8..3e25faa 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -4351,6 +4351,8 @@
       Return a reverse iterator over the keys of the dictionary. This is a
       shortcut for ``reversed(d.keys())``.
 
+      .. versionadded:: 3.8
+
    .. method:: setdefault(key[, default])
 
       If *key* is in the dictionary, return its value.  If not, insert *key*