diff --git a/site/_docs/posts.md b/site/_docs/posts.md
index bc8628c9..d4d8f15d 100644
--- a/site/_docs/posts.md
+++ b/site/_docs/posts.md
@@ -122,7 +122,7 @@ title:  "Welcome to Jekyll!"
 date:   2015-11-17 16:16:01 -0600
 categories: jekyll update
 ---
-You’ll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run `jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.
+You’ll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run `bundle exec jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.
 
 To add new posts, simply add a file in the `_posts` directory that follows the convention `YYYY-MM-DD-name-of-post.ext` and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.