Update README.md

README.md

@@ -22,7 +22,7 @@ model_name: TreeRPO-Qwen2.5-Math-1.5B
 A 1.5B parameter math reasoning model fine-tuned with **TreeRPO**, a hierarchical extension of GRPO that assigns rewards to “thought” nodes (not just full completions). Achieves higher GSM8K accuracy with just ~10K supervised + RL examples and **no reward model**.
 
 🔎 **Full write-up (method, math, analysis):**  
-[TreeRPO: Hierarchical Credit Assignment for Data-Efficient Math Reasoning](https://omrisapir.substack.com/publish/post/167273414)
+[TreeRPO: Hierarchical Credit Assignment for Reasoning in Language Models](https://omrisapir.substack.com/publish/post/167273414)
 
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