diff --git a/docs/developer_guides/chap02_schema.md b/docs/developer_guides/chap02_schema.md
index 522d552307..ce54e2fc38 100644
--- a/docs/developer_guides/chap02_schema.md
+++ b/docs/developer_guides/chap02_schema.md
@@ -61,7 +61,7 @@ To learn how to choose an appropriate index for your application scenarios, plea
 
 To learn how to choose an appropriate index for a metric, see [Distance Metrics](https://www.milvus.io/docs/v2.0.0/metric.md).
 
-Different index types use different index params in construction and query. All index params are represented by the structure of map. This doc shows the map code in python.
+Different index types use different index params in construction and query. All index params are represented by the structure of the map. This doc shows the map code in python.
 
 [IVF_FLAT](#IVF_FLAT)
 [BIN_IVF_FLAT](#BIN_IVF_FLAT)