diff --git a/docs/developer_guides/chap06_root_coordinator.md b/docs/developer_guides/chap06_root_coordinator.md
index 9478af2073..7233d81616 100644
--- a/docs/developer_guides/chap06_root_coordinator.md
+++ b/docs/developer_guides/chap06_root_coordinator.md
@@ -688,7 +688,7 @@ func (mt *metaTable) AddFlushedSegment(segID typeutil.UniqueID) error
 
 - _metaTable_ maintains meta both in memory and _etcdKV_. It keeps meta's consistency in both sides. All its member functions may be called concurrently.
 
-- for _HasCollection_, _GetCollectionByID_, _GetCollectionByName_, _ListCollections_, if the argument of `ts` is none-zero, then _metaTable_ would return the meta on the timestamp of `ts`; if `ts` is zero, _metaTable_ would return the lastest meta
+- for _HasCollection_, _GetCollectionByID_, _GetCollectionByName_, _ListCollections_, if the argument of `ts` is none-zero, then _metaTable_ would return the meta on the timestamp of `ts`; if `ts` is zero, _metaTable_ would return the latest meta
 
 #### 6.7 System Time Synchronization