Add 0.9 to 1.0 note about Passenger

1 files changed, 6 insertions, 0 deletions

diff --git a/UPGRADING.md b/UPGRADING.md
index 4f76b9a377..905f6a41eb 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -4,6 +4,12 @@ Upgrading from Bundler 0.9 to 1.0 is relatively painless. The
 Gemfile API is the same, so your old Gemfiles should continue
 to work.
 
+The "env" file that 0.9 created at `.bundle/environment.rb` has been
+removed. As a side effect of this, Passenger will only find your
+bundled gems if you install with `bundle install --deployment`.
+Alternatively, you can tell Passenger where you gems are installed,
+[something like this](http://bit.ly/passenger-gem-home).
+
 The `bundle lock` command is no longer needed, as the
 Gemfile.lock file is now automatically generated by `bundle install`.
 If you have not yet done so, add your Gemfile.lock to source control