diff --git a/doc/project2-RaftKV.md b/doc/project2-RaftKV.md
index 0bfa2c46..3374c43d 100644
--- a/doc/project2-RaftKV.md
+++ b/doc/project2-RaftKV.md
@@ -184,7 +184,7 @@ You should run `make project2b` to pass all the tests. The whole test is running
 
 To be noted, error handling is an important part of passing the test. You may have already noticed that there are some errors defined in `proto/proto/errorpb.proto` and the error is a field of the gRPC response. Also, the corresponding errors which implement the`error` interface are defined in `kv/raftstore/util/error.go`, so you can use them as a return value of functions.
 
-These errors are mainly related to Region. So it is also a member of `RaftResponseHeader` of `RaftCmdResponse`. When proposing a request or applying a command, there may be some errors. If that, you should return the raft command response with the error, then the error will be further passed to gRPC response. You can use `BindErrResp` provided in `kv/raftstore/cmd_resp.go` to convert these errors to errors defined in `errorpb.proto` when returning the response with an error.
+These errors are mainly related to Region. So it is also a member of `RaftResponseHeader` of `RaftCmdResponse`. When proposing a request or applying a command, there may be some errors. If that, you should return the raft command response with the error, then the error will be further passed to gRPC response. You can use `BindRespError` provided in `kv/raftstore/cmd_resp.go` to convert these errors to errors defined in `errorpb.proto` when returning the response with an error.
 
 In this stage, you may consider these errors, and others will be processed in project3: