diff --git a/extras/readings.md b/extras/readings.md
index 0703c6a..483fe00 100644
--- a/extras/readings.md
+++ b/extras/readings.md
@@ -35,6 +35,7 @@ Name | Author(s)
 Name | Author(s)
 :-- | :--:
 [Modern Operating Systems (4th Edition)](http://www.amazon.com/Modern-Operating-Systems-Andrew-Tanenbaum/dp/013359162X/) | Andrew S. Tanenbaum, Herbert Bos
+[Computer Organization and Design: The Hardware/Software Interface](https://www.amazon.com/gp/product/0124077269) | David Patternson, John Hennessy
 [Computer Networks (5th Edition)](http://www.amazon.com/Computer-Networks-5th-Andrew-Tanenbaum/dp/0132126958/) | Andrew S. Tanenbaum, David J. Wetherall
 [Computer Networking: A Top-Down Approach (6th Edition)](https://www.amazon.com/Computer-Networking-A-Top-Down-Approach/dp/1292153598/) | James F Kurose, Keith W Ross