diff --git a/Readme.md b/Readme.md
index f59fb33..87040d3 100644
--- a/Readme.md
+++ b/Readme.md
@@ -40,4 +40,4 @@ Hacking
 
 To use this buildpack, fork it on Github.  Push up changes to your fork, then create a test app with `--buildpack <your-github-url>` and push to it.
 
-To change the vendored virtualenv, unpack the desired version to the `src/` folder, and update the virtualenv() function in `bin/compile` to prepend the virtualenv module directory to the path. 
\ No newline at end of file
+To change the vendored virtualenv, unpack the desired version to the `src/` folder, and update the virtualenv() function in `bin/compile` to prepend the virtualenv module directory to the path. The virtualenv release vendors its own versions of pip and setuptools.