diff --git a/docs/documentation_index.md b/docs/documentation_index.md
index 56fd6e5a..5031bfbd 100644
--- a/docs/documentation_index.md
+++ b/docs/documentation_index.md
@@ -25,13 +25,13 @@ Then you can work on the documentation:
 
 - Fork home-assistant.io [git repository](https://github.com/home-assistant/home-assistant.io).
 - Create/edit/update a page. The components/platforms documentation is located in `source/_components/`. `source/_docs/` contains the Home Assistant documentation itself. 
-- Test your changes to home-assistant.io locally: run `rake preview` and navigate to [http://127.0.0.1:4000](http://127.0.0.1:4000)
+- Test your changes to home-assistant.io locally: run `bundle exec rake preview` and navigate to [http://127.0.0.1:4000](http://127.0.0.1:4000)
 - Create a Pull Request (PR) against the **next** branch of home-assistant.io if your documentation is a new feature, platform, or component.
 - Create a Pull Request (PR) against the **current** branch of home-assistant.io if you fix stuff, create Cookbook entries, or expand existing documentation.
 
-It could be necessary that you run `rake generate` prior to `rake preview` for the very first preview.
+It could be necessary that you run `bundle exec rake generate` prior to `bundle exec rake preview` for the very first preview.
 
-Site generated by `rake` is only available locally. If you are developing on a headless machine, use port forwarding:
+Site generated by `bundle exec rake` is only available locally. If you are developing on a headless machine, use port forwarding:
 
 ```bash
 $ ssh -L 4000:localhost:4000 user_on_headless_machine@ip_of_headless_machine