diff --git a/docsite/rst/playbooks_tests.rst b/docsite/rst/playbooks_tests.rst
index 51bd025717..2bb31ecf5f 100644
--- a/docsite/rst/playbooks_tests.rst
+++ b/docsite/rst/playbooks_tests.rst
@@ -67,6 +67,8 @@ be used.  The default is ``False``, but this setting as ``True`` uses more stric
 Group theory tests
 ------------------
 
+.. versionadded:: 2.1
+
 To see if a list includes or is included by another list, you can use 'issubset' and 'issuperset'::
 
     vars: