diff --git a/docs/design_docs/segcore/basic_types.md b/docs/design_docs/segcore/basic_types.md
index 7b3099b4be..5cfbd47cc5 100644
--- a/docs/design_docs/segcore/basic_types.md
+++ b/docs/design_docs/segcore/basic_types.md
@@ -4,12 +4,12 @@
 - `Segment`: The memory structure of storing a piece of data which supports concurrent insertion, deletion, query, index loading, monitoring and statistics
 - `Schema`: Definition of collection data format, including
   - `vector<FieldMeta>`: Order list of FieldMeta
-  - `isAutoId`: If set to True , the default primary field is `RowId` and it is auto generated
+  - `isAutoId`: If set to True , the default primary field is `RowId` and it is auto-generated
   - `primaryKey`: (When `isAutoId = False`) Specify primary key field
 - `FieldMeta`: Field properties, including
   - `DataType`: Data type, including Int8...Int64, Float, Double, FloatVector, BinaryVector and String later
   - `Dim`: (When dataType is vector) Type vector dimension
-  - `metric_type`: (When dataType is vector type, optional) The metric type corresponding to this vector is related to the small batch index and can be empty
+  - `metric_type`: (When dataType is vector type, optional) The metric type corresponding to this vector is related to the small-batch index and can be empty
   - `FieldName`: Column name
   - `FieldId`: Unique number of the column
   - (hidden) `FieldOffset`: Which is the subscript of `vector<Field>` in the schema. The internal calculation of segcore is basically based on field offset