diff --git a/oslo_i18n/_factory.py b/oslo_i18n/_factory.py
index 7d6c7e4..c732b01 100644
--- a/oslo_i18n/_factory.py
+++ b/oslo_i18n/_factory.py
@@ -163,6 +163,8 @@ class TranslatorFactory(object):
         The returned function takes two values, the context of
         the unicode string, the unicode string to be translated.
 
+        .. versionadded:: 2.1.0
+
         """
         return self._make_contextual_translation_func()
 
@@ -174,6 +176,8 @@ class TranslatorFactory(object):
         the unicode string, the plural form of the unicode string,
         the count of items to be translated.
 
+        .. versionadded:: 2.1.0
+
         """
         return self._make_plural_translation_func()