September 12, 2011 Patch

{{Patch layout
 * source = http://store.steampowered.com/news/6247/
 * source-title = Portal 2 Update Released


 * before = August 30, 2011 Patch
 * after = October 4, 2011 Patch


 * notes =

Portal 2
}}
 * Fixed purchased items showing up as not tradable after their trade delay expired.