diff --git a/cookbook/pocketflow-thinking/README.md b/cookbook/pocketflow-thinking/README.md
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--- a/cookbook/pocketflow-thinking/README.md
+++ b/cookbook/pocketflow-thinking/README.md
@@ -2,6 +2,8 @@
 
 This project demonstrates an implementation that orchestrates a Chain-of-Thought process, enabling LLMs to solve complex reasoning problems by thinking step-by-step. It's designed to improve problem-solving accuracy through deliberate, structured reasoning managed externally.
 
+This implementation is based on: [Build Chain-of-Thought From Scratch - Tutorial for Dummies](https://zacharyhuang.substack.com/p/build-chain-of-thought-from-scratch).
+
 ## Features
 
 - Improves model reasoning on complex problems.
@@ -80,8 +82,8 @@ This problem demonstrates why structured Chain-of-Thought is valuable:
 For comparison:
 -   [Claude 3.7 Sonnet (single prompt)](https://claude.ai/share/da139326-42fe-42d9-9d7b-35870daa5c1b): Wrong answer
 -   [Claude 3.7 Sonnet (using built-in thinking)](https://claude.ai/share/6f4140ed-f33c-4949-8778-a57719498e40): Correct answer after 3m, 45s
--   [GPT-4o (using built-in thinking)](https://chatgpt.com/share/67fee0fd-2600-8000-bcdf-76e40a986ee4): Correct answer after 2m, 0s
--   [GPT-4 Turbo (using built-in thinking)](https://chatgpt.com/share/67fee11b-530c-8000-92d1-609b6ca49c9c): Correct answer after 4m, 24s
+-   [GPT-o1 (using built-in thinking)](https://chatgpt.com/share/67fee0fd-2600-8000-bcdf-76e40a986ee4): Correct answer after 2m, 0s
+-   [GPT-o1 pro (using built-in thinking)](https://chatgpt.com/share/67fee11b-530c-8000-92d1-609b6ca49c9c): Correct answer after 4m, 24s
 
 Below is an example output trace showing how **this implementation guides Claude 3.7 Sonnet** through the problem-solving process: