diff --git a/docs/_data/translations.yml b/docs/_data/translations.yml
index 57bf28f502..5ad1d8ef15 100644
--- a/docs/_data/translations.yml
+++ b/docs/_data/translations.yml
@@ -7,3 +7,8 @@
   code: zh
   description: Bootstrap 4 中文文档教程
   url: http://boot4.com/
+
+- name: Japanese
+  code: ja
+  description: Bootstrap 4 日本語リファレンス
+  url: http://bootstrap4.jp/