diff --git a/README.md b/README.md
index de30010..9c34e0f 100644
--- a/README.md
+++ b/README.md
@@ -701,6 +701,7 @@ An updated and organized reading list for illustrating the patterns of scalable,
 * [Architecture of Evernote](https://evernote.com/blog/a-digest-of-evernotes-architecture/)
 * [Architecture of Chat Service (3 parts) at Riot Games](https://engineering.riotgames.com/news/chat-service-architecture-persistence)
 * [Architecture of League of Legends Client Update](https://technology.riotgames.com/news/architecture-league-client-update)
+* [Basic Architecture of Slack](https://slack.engineering/how-slack-built-shared-channels-8d42c895b19f)
 * [Back-end at LinkedIn](https://engineering.linkedin.com/architecture/brief-history-scaling-linkedin)
 * [Back-end at Flickr](https://yahooeng.tumblr.com/post/157200523046/introducing-tripod-flickrs-backend-refactored)
 * [Infrastructure (3 parts) at Zendesk](https://medium.com/zendesk-engineering/the-history-of-infrastructure-at-zendesk-part-3-foundation-team-forming-and-evolving-9859e40f5390)