diff --git a/extras/readings.md b/extras/readings.md
index 2d1f6ec..812f2d3 100644
--- a/extras/readings.md
+++ b/extras/readings.md
@@ -48,6 +48,8 @@ Name | Author(s)
 [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
 [Distributed Systems: Principles and Paradigms](https://www.amazon.com/Distributed-Systems-Principles-Andrew-Tanenbaum/dp/153028175X) | Andrew Tanenbaum
+[Operating Systems Design and Implementation](https://www.amazon.com/Operating-Systems-Design-Implementation-3rd/dp/0131429388) | Andrew S. Tanenbaum, Albert S. Woodhull
+[Principles of Compiler Design](https://www.amazon.com/Principles-Compiler-Addison-Wesley-information-processing/dp/0201000229) | Alfred Aho, Jeffrey Ullman
 [Distributed Systems Reading Group](http://dsrg.pdos.csail.mit.edu/papers/) | Various
 [System Design: Design large-scale systems](https://github.com/donnemartin/system-design-primer) | Various