Update index.md

site/en/reference/index.md

@@ -313,7 +313,7 @@ Index building parameters and search parameters vary with Milvus distribution. S
 
 ### SCANN
 
-SCANN (Score-aware quantization loss) is similar to IVF_PQ in terms of vector clustering and product quantization. What makes them different lies in the implementation details of product quantization and the use of SIMD (Single-Instruction / Multi-data) for efficient calculation.
+ScaNN (Scalable Nearest Neighbors) is similar to IVF_PQ in terms of vector clustering and product quantization. What makes them different lies in the implementation details of product quantization and the use of SIMD (Single-Instruction / Multi-data) for efficient calculation.
 
 - Index building parameters