diff --git a/background.js b/background.js
index 8306d22..a569d20 100644
--- a/background.js
+++ b/background.js
@@ -103,7 +103,6 @@ new cron.CronJob({ //eslint-disable-line
       let twch = await db.query({
         text
       })
-      console.log('check twitch channel number :::: ', twch.rowCount)
       let ids = twch.rows.map(t => t.id)
       let streams = await api.twitch.getUserStream(ids)
       if (streams !== null && Array.isArray(streams)) {
@@ -124,7 +123,6 @@ new cron.CronJob({ //eslint-disable-line
 })
 
 const sendStreamNotify = async (streamer = null) => {
-  console.log(streamer)
   if (streamer === null || typeof streamer !== 'object' || !('user_id' in streamer) || !('id' in streamer)) return null
   let db = await DB.connect()
 
diff --git a/libs/api-action/line.js b/libs/api-action/line.js
index 3670e7d..47718b5 100644
--- a/libs/api-action/line.js
+++ b/libs/api-action/line.js
@@ -8,6 +8,11 @@ const client = axios.create({
   }
 })
 
+/**
+ * push message to group or room or user
+ * @param {string} target target id (groupid, userid, roomid)
+ * @param {string} message push message
+ */
 const pushMessage = async (target, message = '') => {
   if (typeof target !== 'string' || target.trim().length === 0) return
   if (typeof message !== 'string' || message.trim().length === 0) return
@@ -31,6 +36,11 @@ const pushMessage = async (target, message = '') => {
   await client(opts)
 }
 
+/**
+ * send reply message
+ * @param {string} replyToken line message reply token
+ * @param {string} message reply message
+ */
 const replyMessage = async (replyToken, message) => {
   let url = '/message/reply'
   let opts = {
diff --git a/libs/line-message/commands/index.js b/libs/line-message/commands/index.js
index 8be22c0..0837fc4 100644
--- a/libs/line-message/commands/index.js
+++ b/libs/line-message/commands/index.js
@@ -15,17 +15,39 @@ const parseCMD = async (text = '', source = {}) => {
   if (arr.length === 0) return null
   if (arr[0][0] !== '!') return null
   let cmd = arr[0].replace(/^!/, '')
-  if (!(cmd in cmds)) return null
+
+  // find default command
+  if (cmd in cmds) {
+    let db = await DB.connect()
+    let result = null
+    try {
+      result = await cmds[cmd](arr.slice(1).join(' '), source, db)
+    } catch (err) {
+      console.log(err)
+    }
+    // if (result === null) return null
+    db.release()
+    return result
+  }
+
   let db = await DB.connect()
-  let result = null
   try {
-    result = await cmds[cmd](arr.slice(1).join(' '), source, db)
+    let text = `select "mrssage" from "public"."commands" where cmd = $1`
+    let values = [cmd]
+    let result = await db.query({
+      text,
+      values
+    })
+    if (result.rowCount === 0) {
+      db.release()
+      return null
+    }
   } catch (err) {
     console.log(err)
+    db.release()
+    return null
   }
-  // if (result === null) return null
   db.release()
-  return result
 }
 
 module.exports = parseCMD
diff --git a/libs/line-message/index.js b/libs/line-message/index.js
index 0ce06fd..1fdff7f 100644
--- a/libs/line-message/index.js
+++ b/libs/line-message/index.js
@@ -1,6 +1,10 @@
 const commands = require('./commands')
 const api = require('../api-action')
 
+/**
+ * parse text message object
+ * @param {object} evt line message event object
+ */
 const textMessage = async (evt) => {
   let {replyToken, source, message} = evt
   if (!source || !('type' in source) || source.type !== 'group') return