* Explicitly mention AngularJS as per john

xiahua · Oct 9, 2014 · 64a33a5 · 64a33a5
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diff --git a/spreadsheet/chapter.md b/spreadsheet/chapter.md
@@ -12,9 +12,11 @@ In the 1990s, browsers added various presentational tags to the HTML vocabulary,
 
 In order to keep HTML to its original purpose—describing a document’s logical structure—browser makers eventually agreed to support two additional languages: CSS to describe presentational styles of a page, and JS to describe its dynamic interactions.
 
-Since then, the three languages have become more concise and powerful through twenty years of co-evolution. Today, cross-platform _Web applications_ (such as Web Spreadsheets) are as ubiquitous and popular as platform-specific applications (such as VisiCalc, Lotus 1-2-3 and Excel) from the previous century.
+Since then, the three languages have become more concise and powerful through twenty years of co-evolution. In particular, improvements in [JS engines](https://en.wikipedia.org/wiki/JavaScript_engine) made it practical to deploy large-scale JS frameworks, such as [AngularJS](http://angularjs.org/).
 
-How many features can a Web application offer in 99 lines? Let’s see it in action!
+Today, cross-platform _Web applications_ (such as Web Spreadsheets) are as ubiquitous and popular as platform-specific applications (such as VisiCalc, Lotus 1-2-3 and Excel) from the previous century.
+
+How many features can a Web application offer in 99 lines with AngularJS? Let’s see it in action!
 
 ## Overview
 

diff --git a/spreadsheet/chapter.zh-tw.md b/spreadsheet/chapter.zh-tw.md
@@ -12,9 +12,11 @@ _(Also available in [English](https://github.com/audreyt/500lines/blob/master/sp
 
 為了保持 HTML 的原本目的（描述文件的邏輯結構），瀏覽器開發者最後同意額外支援兩種語言：CSS 來形容網頁的展示風格，以及 JS 來描述其動態互動功能。
 
-從那時開始，這三種程式語言經過了 20 年的共同進化，已經變得更加簡潔和強大。如今，跨平台的應用網站（Web applications，例如試算表），已經跟上個世紀的桌面應用程式（如 VisiCalc、Lotus 1-2-3 和 Excel）一樣普及了。
+從那時開始，這三種程式語言經過了 20 年的共同進化，已經變得更加簡潔和強大。[JS 引擎](https://zh.wikipedia.org/wiki/JavaScript%E5%BC%95%E6%93%8E)的效能獲得高度提昇，使得大規模的 JS 框架開始盛行，例如 [AngularJS](http://angularjs.org/)。
 
-網頁應用可以在 99 行裡面提供多少功能？讓我們來看看！
+如今，跨平台的應用網站（Web applications，例如試算表），已經跟上個世紀的桌面應用程式（如 VisiCalc、Lotus 1-2-3 和 Excel）一樣普及了。
+
+使用 AngularJS 的網頁應用可以在 99 行裡面提供多少功能？讓我們來看看！
 
 ## 概述