diff --git a/doc/en/doctest.rst b/doc/en/doctest.rst
index 32e37008f..64b5621d4 100644
--- a/doc/en/doctest.rst
+++ b/doc/en/doctest.rst
@@ -105,6 +105,8 @@ itself::
 The 'doctest_namespace' fixture
 -------------------------------
 
+.. versionadded:: 2.10
+
 The ``doctest_namespace`` fixture can be used to inject items into the
 namespace in which your doctests run. It is intended to be used within
 your own fixtures to provide the tests that use them with context.