diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ae9ae0..33855be 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ This project adheres *in spirit* to [Semantic Versioning](http://semver.org/):
 - "Haskell Programming from First Principles" book as a paid alternative to learn Haskell
 - "Think Python" to extras/readings
 - FAQ entries and links under relevant courses
+- "Category Theory: A Gentle Introduction" to extras/readings
 
 ## [7.2.1] 2017-05-14
 ### Updated
diff --git a/extras/readings.md b/extras/readings.md
index 0f9f692..d31fddc 100644
--- a/extras/readings.md
+++ b/extras/readings.md
@@ -48,8 +48,9 @@ Name | Author(s)
 Name | Author(s)
 :-- | :--:
 [Introduction to Computing: Explorations in Language, Logic, and Machines](http://www.computingbook.org/) | David Evans
-[Introduction to Algorithms (3rd Edition)](http://www.amazon.com/Introduction-Algorithms-3rd-MIT-Press/dp/0262033844/) | Thomas H. Cormen,  Charles E. Leiserson, Ronald L. Rivest, Clifford Stein
+[Introduction to Algorithms (3rd Edition)](http://www.amazon.com/Introduction-Algorithms-3rd-MIT-Press/dp/0262033844/) | Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, Clifford Stein
 [The Algorithm Design Manual](https://www.amazon.com/gp/product/1848000693) | Steven Skiena
+[Category Theory: A Gentle Introduction](http://www.logicmatters.net/resources/pdfs/GentleIntro.pdf) | Peter Smith
 
 ## Applications