diff --git a/README-ja.md b/README-ja.md
index 9a989b25..37275585 100644
--- a/README-ja.md
+++ b/README-ja.md
@@ -465,6 +465,7 @@
 * [CAP 理論を振り返る](http://robertgreiner.com/2014/08/cap-theorem-revisited/)
 * [平易な英語でのCAP 理論のイントロ](http://ksat.me/a-plain-english-introduction-to-cap-theorem)
 * [CAP FAQ](https://github.com/henryr/cap-faq)
+* [CAP 理論](https://www.youtube.com/watch?v=k-Yaq8AHlFA)
 
 ## 一貫性パターン