diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index 6d467af098c5a..43c7f561bdbb6 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -235,6 +235,7 @@ Books that cover a specific programming language can be found in the [BY PROGRAM
 * [Computer Organization and Design Fundamentals](https://faculty.etsu.edu/tarnoff/138292) - David Tarnoff (PDF)
 * [Digital Circuit Projects: An Overview of Digital Circuits Through Implementing Integrated Circuits - Second Edition](https://cupola.gettysburg.edu/cgi/viewcontent.cgi?article=1000&context=oer) - Charles W. Kann (PDF) (CC BY)
 * [Dive Into Systems: A Gentle Introduction to Computer Systems](https://diveintosystems.org) - Suzanne J. Matthews, Tia Newhall, Kevin C. Webb (HTML)
+*  [Computer Organization & Architechture: Designing for Performance](https://os.ecci.ucr.ac.cr/ci0114/material/Stallings/Computer-Organization-Architecture-11th.pdf) - William Stallings (PDF)
 
 
 ### Computer Science