Update README.md

README.md

@@ -55,6 +55,7 @@ Also check my other collections [awesome e-commerce](https://github.com/frutik/a
       - [Click models for search](#click-models-for-search)
   - [Bias](#bias)
   - [Diversification](#diversification)
+    - [MMR](#mmr)  
   - [Personalisation](#personalisation)
   - [Zero search results](#zero-search-results)
 - [Search UX](#search-ux)
@@ -306,6 +307,7 @@ Also check my other collections [awesome e-commerce](https://github.com/frutik/a
 #### MMR
 
 * [How to Calculate MMR?](https://www.analyticsvidhya.com/blog/2024/07/hit-rate-mrr-and-mmr-metrics/#h-how-to-calculate-mmr)
+* [Maximal Marginal Relevance to Re-rank results in Unsupervised KeyPhrase Extraction](https://medium.com/tech-that-works/maximal-marginal-relevance-to-rerank-results-in-unsupervised-keyphrase-extraction-22d95015c7c5)
 
 ### Personalisation