diff --git a/free-programming-books-ja.md b/free-programming-books-ja.md
index e5dc9f882..daaf0cc4f 100644
--- a/free-programming-books-ja.md
+++ b/free-programming-books-ja.md
@@ -471,11 +471,11 @@
 
 
 ### Scala
+* [Effective Scala](http://twitter.github.io/effectivescala/index-ja.html)
 * [Learning Scalaz](http://eed3si9n.com/learning-scalaz/ja)
 * [tetrix in Scala](http://eed3si9n.com/tetrix-in-scala-html5-book)
 
 
-
 ### Scheme
 * [Gauche ユーザリファレンス](http://practical-scheme.net/gauche/man/gauche-refj.html) - 川合史朗
 * [お気楽 Scheme プログラミング入門](http://www.geocities.jp/m_hiroi/func/scheme.html) - 広井誠