Update README.md

README.md

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 ## Quality Benchmarks
 **PIXIE-Splade-Preview** delivers consistently strong performance across a diverse set of domain-specific and open-domain benchmarks in Korean, demonstrating its effectiveness in real-world search applications. 
 The table below presents the retrieval performance of several embedding models evaluated on a variety of Korean MTEB benchmarks. 
-We report Normalized Discounted Cumulative Gain (NDCG) scores, which measure how well a ranked list of documents aligns with ground truth relevance. Higher values indicate better retrieval quality.
+We report **Normalized Discounted Cumulative Gain (NDCG)** scores, which measure how well a ranked list of documents aligns with ground truth relevance. Higher values indicate better retrieval quality.
 - **Avg. NDCG**: Average of NDCG@1, @3, @5, and @10 across all benchmark datasets.  
 - **NDCG@k**: Relevance quality of the top-*k* retrieved results.