diff --git a/dtmgrpc/dtmgimp/types.go b/dtmgrpc/dtmgimp/types.go
index bb7fcaf..7710665 100644
--- a/dtmgrpc/dtmgimp/types.go
+++ b/dtmgrpc/dtmgimp/types.go
@@ -58,7 +58,7 @@ func InvokeBranch(t *dtmimp.TransBase, isRaw bool, msg proto.Message, url string
 	}
 	ctx := TransInfo2Ctx(t.Gid, t.TransType, branchID, op, t.Dtm)
 	ctx = metadata.AppendToOutgoingContext(ctx, Map2Kvs(t.BranchHeaders)...)
-	if t.TransType == "xa" { // xa branch need addtional phase2_url
+	if t.TransType == "xa" { // xa branch need additional phase2_url
 		ctx = metadata.AppendToOutgoingContext(ctx, Map2Kvs(map[string]string{dtmpre + "phase2_url": url})...)
 	}
 	return MustGetGrpcConn(server, isRaw).Invoke(ctx, method, msg, reply)
diff --git a/dtmgrpc/dtmgimp/utils.go b/dtmgrpc/dtmgimp/utils.go
index 0e46c70..b1e4b36 100644
--- a/dtmgrpc/dtmgimp/utils.go
+++ b/dtmgrpc/dtmgimp/utils.go
@@ -102,6 +102,7 @@ func GetMetaFromContext(ctx context.Context, name string) string {
 	return mdGet(md, name)
 }
 
+// GetDtmMetaFromContext get dtm header from context
 func GetDtmMetaFromContext(ctx context.Context, name string) string {
 	md, _ := metadata.FromIncomingContext(ctx)
 	return dtmGet(md, name)