diff --git a/README.md b/README.md
index f798eb5..74bde13 100644
--- a/README.md
+++ b/README.md
@@ -24,11 +24,13 @@ You can find all the books listed below in [**book**](/book) folder of this repo
* JavaScript - The Definitive Guide, 6th edition [[Download]](/book/JavaScript%20-%20The%20Definitive%20Guide%2C%206th%20edition.pdf)
* Learning JavaScript [[Download]](/book/Learning%20JavaScript.pdf)
* Learning Vue.js 2 [[Download]](/book/Learning%20Vue.js%202.pdf)
+* Learning WebRTC [[Download]](/book/Learning%20WebRTC.pdf)
* Mastering Web Application Development with AngularJS [[Download]](/book/Mastering%20Web%20Application%20Development%20with%20AngularJS.pdf)
* Practical CSS3 - Develop and Design [[Download]](/book/Practical%20CSS3%20-%20Develop%20and%20Design.pdf)
* Pragmatic Guide to JavaScript - JavaScript修炼之道 [[Download]](/book/Pragmatic%20Guide%20to%20JavaScript%20-%20JavaScript%E4%BF%AE%E7%82%BC%E4%B9%8B%E9%81%93.pdf)
* Pro JavaScript Performance [[Download]](/book/Pro%20JavaScript%20Performance.pdf)
* Seven Web Frameworks in Seven Weeks [[Download]](/book/Seven%20Web%20Frameworks%20in%20Seven%20Weeks.pdf)
+* Socket.IO Real-time Web Application Development [[Download]](/book/Socket.IO%20Real-time%20Web%20Application%20Development.pdf)
* The Majesty of Vue.js [[Download]](/book/The%20Majesty%20of%20Vue.js.pdf)
* The Modern Web - Multi-Device Web Development with HTML5, CSS3, and JavaScript [[Download]](/book/The%20Modern%20Web%20-%20Multi-Device%20Web%20Development%20with%20HTML5%2C%20CSS3%2C%20and%20JavaScript.pdf)
* The Past, Present, and Future of JavaScript [[Download]](/book/The%20Past%2C%20Present%2C%20and%20Future%20of%20JavaScript.pdf)
@@ -37,6 +39,11 @@ You can find all the books listed below in [**book**](/book) folder of this repo
* Thinking in HTML [[Download]](/book/Thinking%20in%20HTML.pdf)
* Thinking in JavaScript [[Download]](/book/Thinking%20in%20JavaScript.pdf)
* TypeScript Design Patterns [[Download]](/book/TypeScript%20Design%20Patterns.pdf)
+* Web Performance in Action [[Download]](/book/Web%20Performance%20in%20Action.mobi)
+* WebRTC Blueprints [[Download]](/book/WebRTC%20Blueprints.pdf)
+* WebRTC Cookbook [[Download]](/book/WebRTC%20Cookbook.pdf)
+* WebRTC Integrator's Guide [[Download]](/book/WebRTC%20Integrator%27s%20Guide.pdf)
+* WebSocket Essentials – Building Apps with HTML5 WebSockets [[Download]](/book/WebSocket%20Essentials%20%E2%80%93%20Building%20Apps%20with%20HTML5%20WebSockets.pdf)
* WordPress 3 Complete [[Download]](/book/WordPress%203%20Complete.pdf)
* 深入浅出HTML与CSS、XHTML [[Download]](/book/%E6%B7%B1%E5%85%A5%E6%B5%85%E5%87%BAHTML%E4%B8%8ECSS%E3%80%81XHTML.pdf)
* 精彩绝伦的CSS [[Download]](/book/%E7%B2%BE%E5%BD%A9%E7%BB%9D%E4%BC%A6%E7%9A%84CSS.pdf)
diff --git a/book/Learning WebRTC.pdf b/book/Learning WebRTC.pdf
new file mode 100644
index 0000000..4617ba9
Binary files /dev/null and b/book/Learning WebRTC.pdf differ
diff --git a/book/Socket.IO Real-time Web Application Development.pdf b/book/Socket.IO Real-time Web Application Development.pdf
new file mode 100644
index 0000000..0b4452d
--- /dev/null
+++ b/book/Socket.IO Real-time Web Application Development.pdf
@@ -0,0 +1,11353 @@
+%PDF-1.6
%
+1544 0 obj
<>/Outlines 1260 0 R/Metadata 1578 0 R/AcroForm 1557 0 R/Pages 1507 0 R/Type/Catalog/PageLabels 1502 0 R>>
endobj
1545 0 obj
<>
endobj
1260 0 obj
<>
endobj
1578 0 obj
<>stream
+
+