diff --git a/docs/_docs/01-quick-start-guide.md b/docs/_docs/01-quick-start-guide.md
index 2d159254..bf447c45 100644
--- a/docs/_docs/01-quick-start-guide.md
+++ b/docs/_docs/01-quick-start-guide.md
@@ -53,6 +53,8 @@ Run `bundle update` and verify that all gems install properly.
 
 Add `remote_theme: "mmistakes/minimal-mistakes"` to your `_config.yml` file. Remove any other `theme:` or `remote_theme:` entry.
 
+You may also optionally specify a branch, [tag](https://github.com/mmistakes/minimal-mistakes/tags), or commit to use by appending an @ and the Git ref (e.g., `mmistakes/minimal-mistakes@4.9.0` or `mmistakes/minimal-mistakes@bbf3cbc5fd64a3e1885f3f99eb90ba92af84063d`). If you don't specify a Git ref, the master branch will be used.
+
 ---
 
 **Note:** Your Jekyll site should be viewable immediately at <http://USERNAME.github.io>. If it's not, you can force a rebuild by **Customizing Your Site** (see below for more details).
diff --git a/docs/_docs/04-upgrading.md b/docs/_docs/04-upgrading.md
index 69b2d4dc..1fa573d7 100644
--- a/docs/_docs/04-upgrading.md
+++ b/docs/_docs/04-upgrading.md
@@ -2,7 +2,7 @@
 title: "Upgrading"
 permalink: /docs/upgrading/
 excerpt: "Instructions and suggestions for upgrading the theme."
-last_modified_at: 2018-01-08T12:10:30-05:00
+last_modified_at: 2018-01-08T20:10:30-05:00
 toc: true
 ---
 
@@ -25,11 +25,21 @@ At the top of every `.html` file, `/assets/css/main.css`, and `/assets/js/main.m
 
 Simply run `bundle update` if you're using Bundler (have a `Gemfile`) or `gem update minimal-mistakes-jekyll` if you're not.
 
+When using Bundler you can downgrade or lock the theme to a specific release ([tag](https://github.com/mmistakes/minimal-mistakes/tags)), branch, or commit. Instead of `gem "minimal-mistakes-jekyll"` you'd add the following to your `Gemfile`:
+
+```ruby
+gem "minimal-mistakes-jekyll", :git => "https://github.com/mmistakes/minimal-mistakes.git", :tag => "4.9.0"
+```
+
+For more information on [installing gems from git repositories](http://bundler.io/v1.16/guides/git.html) consult Bundler's documentation.
+
 ## Remote Theme
 
-When hosting with GitHub Pages you'll need to push up a commit to force a rebuild with the latest [theme release](https://github.com/mmistakes/minimal-mistakes/releases).
+When setting `remote_theme: "mmistakes/minimal-mistakes"` in your `_config.yml` you may also optionally specify a branch, [tag](https://github.com/mmistakes/minimal-mistakes/tags), or commit to use by appending an @ and the Git ref.
 
-An empty commit will get the job done too if you don't have anything to push at the moment:
+For example you can roll back to release 4.8.1 with `mmistakes/minimal-mistakes@4.8.1` or a specific commit with `mmistakes/minimal-mistakes@bbf3cbc5fd64a3e1885f3f99eb90ba92af84063d`).
+
+To update the theme on GitHub Pages you'll need to push up a commit to force a rebuild. An empty commit works well if you don't have anything to push at the moment:
 
 ```terminal
 git commit --allow-empty -m "Force rebuild of site"