diff --git a/docs/design_docs/milvus_create_index_en.md b/docs/design_docs/milvus_create_index_en.md
index 43d204e48b..6275350423 100644
--- a/docs/design_docs/milvus_create_index_en.md
+++ b/docs/design_docs/milvus_create_index_en.md
@@ -1,5 +1,5 @@
 # Create Index
-`Index system` is the core part of `Milvus`, which is used to speed up the searches, this document indroduces which components are involved in `Create Index`,and what do these components do?
+`Index system` is the core part of `Milvus`, which is used to speed up the searches, this document indroduces which components are involved in `Create Index`,and what these components do.
 
 The execution flow of `Create Index` is shown in the following figure: