diff --git a/free-programming-books-ru.md b/free-programming-books-ru.md
index 8dd096cd48b46fa64952c329018cee6a2ea7a46e..6b78ed25ae7e149f946513c71dc6cca5ca7d9d28 100644
--- a/free-programming-books-ru.md
+++ b/free-programming-books-ru.md
@@ -139,6 +139,7 @@
 
 ###Scala
 
+* [Effective Scala](http://twitter.github.io/effectivescala/index-ru.html) - Marius Eriksen
 * [Scala Школа!](http://twitter.github.io/scala_school/ru/) - Twitter
 
 ###Scilab
diff --git a/free-programming-books-zh.md b/free-programming-books-zh.md
index 2d2ba7b06c32c4605523e780daa6e91782ed8ddf..04ca4a655160873198e6659a2bc9b648ef755a23 100644
--- a/free-programming-books-zh.md
+++ b/free-programming-books-zh.md
@@ -51,6 +51,7 @@
 * [Real World Haskell 中文版](http://rwh.readthedocs.org/en/latest/)
 
 ### Scala
+* [Effective Scala](http://twitter.github.io/effectivescala/index-cn.html) - Marius Eriksen
 * [Scala 课堂](http://twitter.github.io/scala_school/zh_cn/index.html) (Twitter的Scala中文教程)
 
 ### Shell