diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index fb078f4c..c847501d 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -14,6 +14,7 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 * [Cloud Computing](#cloud-computing)
 * [Competitive Programming](#competitive-programming)
 * [Compiler Design](#compiler-design)
+* [Computer Organization and Architecture](#computer-organization-and-architecture)
 * [Computer Science](#computer-science)
 * [Computer Vision](#computer-vision)
 * [Containers](#containers)
@@ -195,6 +196,12 @@ Books that cover a specific programming language can be found in the  [BY PROGRA
 * [The ANTLR Mega Tutorial](https://tomassetti.me/antlr-mega-tutorial/)
 
 
+### Computer Organization and Architecture
+
+* [Basic Computer Architecture](https://www.cse.iitd.ac.in/~srsarangi/archbooksoft.html) - Smruti R. Sarangi (HTML, PDF, Slides, Videos)
+* [Computer Organization and Design Fundamentals](https://faculty.etsu.edu/tarnoff/138292) - David Tarnoff (PDF)
+
+
 ### Computer Science
 
 * [Computational Thinking](https://www.cs.cmu.edu/~15110-s13/Wing06-ct.pdf) - Jeannette Wing, Carnegie-Mellon University (PDF)