diff --git a/upgrades/upgrades/fout-dot-two-to-four-dot-three.md b/upgrades/upgrades/four-dot-two-to-four-dot-three.md
similarity index 97%
rename from upgrades/upgrades/fout-dot-two-to-four-dot-three.md
rename to upgrades/upgrades/four-dot-two-to-four-dot-three.md
index 26b2561..a73e3f5 100644
--- a/upgrades/upgrades/fout-dot-two-to-four-dot-three.md
+++ b/upgrades/upgrades/four-dot-two-to-four-dot-three.md
@@ -78,9 +78,9 @@ rails db:migrate
 
 ## Upgrade Sprockets to v4
 
-In your project create  `app/assets/config/manifest.jss` file with contents: 
+In your project create `app/assets/config/manifest.js` file with contents:
 
-```ruby
+```js
 //= link_tree ../images
 //= link_tree ../javascripts
 //= link_directory ../stylesheets .css