diff --git a/doc/project3-MultiRaftKV.md b/doc/project3-MultiRaftKV.md
index d06bfd68..6e100db4 100644
--- a/doc/project3-MultiRaftKV.md
+++ b/doc/project3-MultiRaftKV.md
@@ -101,8 +101,8 @@ So your task is to implement the process of handling split admin command, just l
 > - The corresponding Peer of this newly-created Region should be created by
 `createPeer()` and registered to the router.regions. And the region’s info should be inserted into `regionRanges` in ctx.StoreMeta.
 > - For the case region split with network isolation, the snapshot to be applied may have overlap with the existing region’s range. The check logic is in `checkSnapshot()` in `kv/raftstore/peer_msg_handler.go`. Please keep it in mind when implementing and take care of that case.
-> - Use `engine_util.ExceedEndKey()` to compare with region’s end key. Because when the end key equals “”, any key will equal or greater than “”. > - There are more errors need to be considered: `ErrRegionNotFound`,
-`ErrKeyNotInRegion`, `ErrEpochNotMatch`.
+> - Use `engine_util.ExceedEndKey()` to compare with region’s end key. Because when the end key equals “”, any key will equal or greater than “”. 
+> - There are more errors need to be considered: `ErrRegionNotFound`, `ErrKeyNotInRegion`, `ErrEpochNotMatch`.
 
 ## Part C
 
diff --git a/kv/raftstore/raftstore.go b/kv/raftstore/raftstore.go
index 351cd7ca..e4647294 100644
--- a/kv/raftstore/raftstore.go
+++ b/kv/raftstore/raftstore.go
@@ -37,7 +37,7 @@ func (r *regionItem) Less(other btree.Item) bool {
 
 type storeMeta struct {
 	sync.RWMutex
-	/// region end key -> region ID
+	/// region start key -> region
 	regionRanges *btree.BTree
 	/// region_id -> region
 	regions map[uint64]*metapb.Region