diff --git a/dtmsvr/api.go b/dtmsvr/api.go
index 785be64..fbe7cf9 100644
--- a/dtmsvr/api.go
+++ b/dtmsvr/api.go
@@ -71,6 +71,7 @@ func svcForceStop(t *TransGlobal) interface{} {
 	if err != nil {
 		return err
 	}
+	t.ForceStopReason = ""
 	dbt.statusFailed(string(extData))
 	branches := GetStore().FindBranches(t.Gid)
 	return dbt.Process(branches)
diff --git a/dtmsvr/storage/boltdb/boltdb.go b/dtmsvr/storage/boltdb/boltdb.go
index 0c38708..4a124d7 100644
--- a/dtmsvr/storage/boltdb/boltdb.go
+++ b/dtmsvr/storage/boltdb/boltdb.go
@@ -364,6 +364,7 @@ func (s *Store) ChangeGlobalStatus(global *storage.TransGlobalStore, newStatus s
 	dtmimp.E2P(err)
 }
 
+// StatusFailed change global trans status to failed with reason
 func (s *Store) StatusFailed(global *storage.TransGlobalStore, updates []string) {
 	old := global.Status
 	global.Status = dtmcli.StatusFailed
diff --git a/dtmsvr/storage/redis/redis.go b/dtmsvr/storage/redis/redis.go
index 0d86099..3b63d0a 100644
--- a/dtmsvr/storage/redis/redis.go
+++ b/dtmsvr/storage/redis/redis.go
@@ -232,6 +232,7 @@ end
 	dtmimp.E2P(err)
 }
 
+// StatusFailed change global trans status to failed with reason
 func (s *Store) StatusFailed(global *storage.TransGlobalStore, updates []string) {
 	old := global.Status
 	global.Status = dtmcli.StatusFailed
diff --git a/dtmsvr/storage/sql/sql.go b/dtmsvr/storage/sql/sql.go
index a4b8945..923b60c 100644
--- a/dtmsvr/storage/sql/sql.go
+++ b/dtmsvr/storage/sql/sql.go
@@ -128,7 +128,7 @@ func (s *Store) ChangeGlobalStatus(global *storage.TransGlobalStore, newStatus s
 	}
 }
 
-// StatusFailed changes global trans status to failed
+// StatusFailed change global trans status to failed with reason
 func (s *Store) StatusFailed(global *storage.TransGlobalStore, updates []string) {
 	old := global.Status
 	global.Status = dtmcli.StatusFailed
diff --git a/dtmsvr/storage/trans.go b/dtmsvr/storage/trans.go
index ed80f6d..b535065 100644
--- a/dtmsvr/storage/trans.go
+++ b/dtmsvr/storage/trans.go
@@ -39,7 +39,7 @@ type TransGlobalStore struct {
 	NextCronTime     *time.Time          `json:"next_cron_time,omitempty"`
 	Owner            string              `json:"owner,omitempty"`
 	Ext              TransGlobalExt      `json:"-" gorm:"-"`
-	ForceStopReason  string              `json:"force_stop_reason" gorm:"-"`
+	ForceStopReason  string              `json:"force_stop_reason,omitempty" gorm:"-"` // only for request
 	ExtData          string              `json:"ext_data,omitempty"` // storage of ext. a db field to store many values. like Options
 	dtmcli.TransOptions
 }
diff --git a/dtmsvr/trans_status.go b/dtmsvr/trans_status.go
index 6d27df2..70cd54a 100644
--- a/dtmsvr/trans_status.go
+++ b/dtmsvr/trans_status.go
@@ -58,13 +58,14 @@ func (t *TransGlobal) changeStatus(status string) {
 	t.Status = status
 }
 
+// ExtDataType case extData type
 type ExtDataType string
 
 const (
-	ExtDataTypeDefault   ExtDataType = ""
 	ExtDataTypeForceStop ExtDataType = "forceStop"
 )
 
+// ExtData custom extData struct
 type ExtData struct {
 	Type ExtDataType `json:"type"`
 	Msg  string      `json:"msg"`