diff --git a/README.md b/README.md
index 215b675c..ba045b61 100644
--- a/README.md
+++ b/README.md
@@ -127,6 +127,8 @@ Following is a list of awesome projects building on top of Reasoning Gym:
 - [(PrimeIntellect) SYNTHETIC-2: a massive open-source reasoning dataset](https://www.primeintellect.ai/blog/synthetic-2)
 - [(Gensyn) RL Swarm: a framework for planetary-scale collaborative RL](https://x.com/gensynai/status/1937917790922649669)
 - [(Axon RL) GEM: a comprehensive framework for RL environments](https://github.com/axon-rl/gem)
+- [(FAIR at Meta) OptimalThinkingBench: Evaluating Over and Underthinking in LLMs](https://github.com/facebookresearch/RAM/tree/main/projects/otb)
+
 ## 📝 Citation
 
 If you use this library in your research, please cite the paper: