diff --git a/docs/design_docs/segcore/basic_types.md b/docs/design_docs/segcore/basic_types.md
index 5cfbd47cc5..bc440cb682 100644
--- a/docs/design_docs/segcore/basic_types.md
+++ b/docs/design_docs/segcore/basic_types.md
@@ -1,16 +1,16 @@
 # Glossary
 
-- `Collection`: Data table containing multiple Segments
-- `Segment`: The memory structure of storing a piece of data which supports concurrent insertion, deletion, query, index loading, monitoring and statistics
+- `Collection`: Data table containing multiple Segments.
+- `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
-  - `primaryKey`: (When `isAutoId = False`) Specify primary key field
+  - `vector<FieldMeta>`: Order list of FieldMeta.
+  - `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
-  - `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
-- `Span`: Similar to STD::span. It supports vector type of data and can be implicitly converted to `SpanBase` for interface overwrite
+  - `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.
+  - `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.
+- `Span`: Similar to STD::span. It supports vector type of data and can be implicitly converted to `SpanBase` for interface overwrite.