diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7f66378..610c025 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -38,6 +38,7 @@ Then you can get your Ruby dependencies installed with:
 
 ``` bash
 $ gem install jekyll bundler
+$ bundle install
 ```
 
 # Serve Website