diff --git a/articles/smalltalk.md b/articles/smalltalk.md
index 1f50d84..eb0804d 100644
--- a/articles/smalltalk.md
+++ b/articles/smalltalk.md
@@ -52,8 +52,9 @@ return and cascade. It has both zero argument and one argument blocks."
 
 ## Implementations
 - [Squeak](https://squeak.org/)
-- [Pharo](https://pharo.org/): fork of Squeak
-- [GNU Smalltalk](https://www.gnu.org/software/smalltalk/): headless implementation
+- [Cuis-Smalltalk](https://cuis.st/): fork of Squak; aims to be small and simple, so a single person can understand the system entirely.
+- [Pharo](https://pharo.org/): fork of Squeak; quite unintuitive (they also avoid using 'Smalltalk' for some reason), limited learning resources.
+- [GNU Smalltalk](https://www.gnu.org/software/smalltalk/): headless implementation, underdocumented (as anything GNU).
 - ...
 
 ## Examples
@@ -100,6 +101,7 @@ TODO
 ## Resources
 - <https://learnxinyminutes.com/smalltalk>
 - [Smalltalk Cheatsheet](https://angelfire.com/tx4/cus/notes/smalltalk.html)
+- [The Cuis Book](https://cuis-smalltalk.github.io/TheCuisBook/)
 - [GNU Smalltalk User's Guide](https://www.gnu.org/software/smalltalk/manual/)
 - [GNU Smalltalk tutorial](https://www.gnu.org/software/smalltalk/manual/html_node/Tutorial.html)
 - [*The Cuneiform Tablets of 2015*](https://tinlizzie.org/VPRIPapers/tr2015004_cuneiform.pdf):