Update README.md

README.md

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 Vectara is an end-to-end platform to embed powerful generative AI features with extraordinary results. 
-We provide simple APIs for indexing documents and generating summaries using Grounded Generation (aka retrieval-augmented-generation), 
+We provide simple APIs for indexing documents and generating summaries using retrieval augmented generation (RAG), 
 all in a managed service that dramatically simplifies the task of building scalable, secure and reliable GenAI applications.
 
 To learn more - here are some resources:
@@ -22,3 +22,6 @@ To learn more - here are some resources:
   * [AskNews](https://asknews.demo.vectara.com/)
   * [AskGSB](https://askgsb.demo.vectara.com/)
   * [Legal Aid](https://legalaid.demo.vectara.com/)
+* Our [Hughes Hallucination Evaluation Mode](https://huggingface.co/vectara/hallucination_evaluation_model) or HHEM is a model to detect LLM hallucinations.
+  * [HHEM leaderboard](https://huggingface.co/spaces/vectara/leaderboard)
+  * Our platform provides a production-grade factual consistency score (aka HHEM v2) which provides longer sequence length, is calibrated, and integrated with our Query APIs.