diff --git a/docs/design_docs/milvus_create_index_en.md b/docs/design_docs/milvus_create_index_en.md
index 308e347f9f..b293db102a 100644
--- a/docs/design_docs/milvus_create_index_en.md
+++ b/docs/design_docs/milvus_create_index_en.md
@@ -220,7 +220,7 @@ message SegmentInfo {
 
 ```
 
-17. If an user has called `CreateIndex` on this `Collection`, then when `RootCoord` receives `SegmentFlushCompleted` request, it would extract the `SegmentID` from the request, and send a `GetInsertBinlogPaths` request to `DataCoord` to get the `Binlog` paths, finally `RootCoord` would send a `BuildIndex` request to `IndexCoord` to notify `IndexCoord` to build index on this segment.
+17. If a user has called `CreateIndex` on this `Collection`, then when `RootCoord` receives `SegmentFlushCompleted` request, it would extract the `SegmentID` from the request, and send a `GetInsertBinlogPaths` request to `DataCoord` to get the `Binlog` paths, finally `RootCoord` would send a `BuildIndex` request to `IndexCoord` to notify `IndexCoord` to build index on this segment.
 
 18. The `Grpc` call of `SegmentFlushCompleted` might be failed due to network problem or some others, so how to create an index if the `Grpc` failed ? The following figure shows the solution.