diff --git a/Doc/library/test.rst b/Doc/library/test.rst
index f7e6eba..e24f69c 100644
--- a/Doc/library/test.rst
+++ b/Doc/library/test.rst
@@ -1609,6 +1609,8 @@
 The :mod:`test.support.bytecode_helper` module provides support for testing
 and inspecting bytecode generation.
 
+.. versionadded:: 3.9
+
 The module defines the following class:
 
 .. class:: BytecodeTestCase(unittest.TestCase)