README.md in jekyll_pages_api-0.1.5 vs README.md in jekyll_pages_api-0.1.6

@@ -12,9 +12,15 @@
 group :jekyll_plugins do
   gem 'jekyll_pages_api'
 end
 ```
 
+If you're creating a new Gemfile in your Jekyll project, make sure to include a source at the top:
+
+```ruby
+source 'https://rubygems.org'
+```
+
 And then execute:
 
 ```bash
 bundle
 bundle exec jekyll serve