open up the addon definition

Author: jenweber

_posts/2014-04-05-overview.md

@@ -14,15 +14,15 @@ a fast [Broccoli](https://github.com/broccolijs/broccoli#broccoli)-powered
 build pipeline.
 Whether you are looking for a zero-config experience or the ability to make your own customizations, Ember CLI has the tools you need.
 
-There are thousands of JavaScript libraries made specifically for Ember.
-We call them addons.
+There are thousands of JavaScript libraries that work great in Ember.
+When an npm package offers some Ember-specific conveniences, we call it an "addon."
 Ember CLI’s [addon system](/extending/#developing-addons-and-blueprints)
 provides a way to create reusable units of code, share components and styling, 
 extend the build tooling, and more — all with a minimal configuration.
 To view a complete list of addons, visit 
 [EmberObserver](https://www.emberobserver.com/).
 You can still use your favorite npm packages directly too.
-If they are not available as addons yet, you can add them into your asset 
+If they are not available as addons yet, you can add them into your build 
 pipeline or create your own addon wrappers.
 
 Ember CLI's [asset compilation system](/user-guide/#asset-compilation) has out-of-the-box support for: