diff --git a/TODO b/TODO
index 5548c03..26a0fb0 100644
--- a/TODO
+++ b/TODO
@@ -129,3 +129,6 @@ https://tools.ietf.org/doc/tcllib/html/crc16.html
 
 ---- System Design
 https://github.com/shashank88/system_design
+
+----- Distributed Systems
+https://www.youtube.com/watch?v=nyNCSM4vGF4