Implemented PEP 405 (Python virtual environments).
diff --git a/Doc/library/development.rst b/Doc/library/development.rst
index 06e7048..2368769 100644
--- a/Doc/library/development.rst
+++ b/Doc/library/development.rst
@@ -23,3 +23,4 @@
    unittest.mock-examples.rst
    2to3.rst
    test.rst
+   venv.rst