diff --git a/Testing.md b/Testing.md
index 5a532ac..2981076 100644
--- a/Testing.md
+++ b/Testing.md
@@ -5,7 +5,7 @@ Tracks uses two different technologies for testing:
 ## Setup
 
 ### Gems
-The tests make use of some gems which need to be installed first. If you have previously done a `bundle install --without development test` you will need to edit your `.bundle/config` and re-run `bundle install`.
+The tests make use of some gems which need to be installed first. If you have previously done a `bundle install --without development test` you will need to run `bundle config --delete without` to edit your Bundler configuration, then re-run `bundle install`.
 
 ### Database
 Ensure you have the `test` section properly configured in your `config/database.yml`. The test environment should have its own database and should not share with the development or production environments.