diff --git a/docs/design_docs/segcore/segment_growing.md b/docs/design_docs/segcore/segment_growing.md
index 34948918b7..1279028ccb 100644
--- a/docs/design_docs/segcore/segment_growing.md
+++ b/docs/design_docs/segcore/segment_growing.md
@@ -4,11 +4,11 @@ Growing segment has the following additional interfaces:
 
 1. `PreInsert(size) -> reseveredOffset`: serial interface, which reserves space for future insertion and returns the `reseveredOffset`.
 
-2. `Insert(reseveredOffset, size, ...Data...)`: write `...Data...` into range `[reseveredOffset, reseveredOffset + size)`. this interface is allowed to be called concurrently.
+2. `Insert(reseveredOffset, size, ...Data...)`: write `...Data...` into range `[reseveredOffset, reseveredOffset + size)`. This interface is allowed to be called concurrently.
 
    1. `...Data...` contains row_ids, timestamps two system attributes, and other columns
    2. data column can be stored either row based or column based.
-   3. `PreDelete & Delete(reseveredOffset, row_ids, timestamps)` is the delete interface similar to insert interface.
+   3. `PreDelete & Delete(reseveredOffset, row_ids, timestamps)` is a delete interface similar to insert interface.
 
 Growing segment stores data in the form of chunk. The number of rows in each chunk is restricted by configs.