diff --git a/free-programming-books.md b/free-programming-books.md
index abd631b6d..6bf4ceadf 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -1160,6 +1160,7 @@
 * [Learn CSS Layout](http://learnlayout.com)
 * [Learn CSS Layout the pedantic way](http://book.mixu.net/css/)
 * [Pro HTML5 Programming]( http://apress.jensimmons.com/v5/pro-html5-programming/ch0.html)
+* [MaintainableCSS](http://maintainablecss.com/)
 * [Scalable and Modular Architecture for CSS](https://smacss.com) - Jonathan Snook
 * [Web Audio API](http://chimera.labs.oreilly.com/books/1234000001552) - Boris Smus