diff --git a/database/notes/04-transactions-indexes.md b/database/notes/04-transactions-indexes.md
index 85fccf8..b57ea47 100644
--- a/database/notes/04-transactions-indexes.md
+++ b/database/notes/04-transactions-indexes.md
@@ -423,4 +423,5 @@ ALTER TABLE `students` ADD INDEX `phone` (`phone`)
 ## Further reading
 * [Critique of isolation levels](https://blog.acolyer.org/2016/02/24/a-critique-of-ansi-sql-isolation-levels/)
 * [Indexes](https://vertabelo.com/blog/what-is-database-index/)
-* [Indexes Data Structure](https://www.vertabelo.com/blog/all-about-indexes-part-2-mysql-index-structure-and-performance/)
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+* [Indexes Data Structure](https://www.vertabelo.com/blog/all-about-indexes-part-2-mysql-index-structure-and-performance/)
+* [Write-ahead logging and MySQL](https://dev.mysql.com/blog-archive/mysql-8-0-new-lock-free-scalable-wal-design/)
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