diff --git a/docs/design_docs/datanode_recovery_design_0513_2021.md b/docs/design_docs/datanode_recovery_design_0513_2021.md
index 9efb9ff608..e537679e45 100644
--- a/docs/design_docs/datanode_recovery_design_0513_2021.md
+++ b/docs/design_docs/datanode_recovery_design_0513_2021.md
@@ -6,16 +6,15 @@ update: 6.21.2021, by [Goose](https://github.com/XuanYang-cn)
 
 ## What's DataNode?
 
-DataNode processes insert data and persists them.
+DataNode processes insert data and persist them.
 
 DataNode is based on flowgraph; each flowgraph cares about only one vchannel. There are ddl messages, dml
 messages, and timetick messages inside one vchannel, FIFO log stream.
 
 One vchannel only contains dml messages of one collection. A collection consists of many segments, hence
-a vchannel contains dml messages of many segments. **Most importantly, the dml messages of the same segment
-can appear in anywhere in vchannel.**
+a vchannel contains dml messages of many segments. **Most importantly, the dml messages of the same segment can appear anywhere in vchannel.**
 
-## What does DataNode recovery really mean?
+## What is the real meaning of DataNode recovery?
 
 DataNode is stateless, but vchannel has states. DataNode's statelessness is guaranteed by DataCoord, which
 means the vchannel's state is maintained by DataCoord. So DataNode recovery is no different from starting.