diff --git a/packaging/os/apt.py b/packaging/os/apt.py
index 53027a464f0..cfaec0505d3 100755
--- a/packaging/os/apt.py
+++ b/packaging/os/apt.py
@@ -101,6 +101,7 @@ options:
     default: no
     choices: [ "yes", "no" ]
     aliases: [ 'autoclean']
+    version_added: "2.1"
 requirements: [ python-apt, aptitude ]
 author: "Matthew Williams (@mgwilliams)"
 notes: