diff --git a/.sequelizerc b/.sequelizerc
new file mode 100644
index 0000000..29a0d14
--- /dev/null
+++ b/.sequelizerc
@@ -0,0 +1,8 @@
+var path = require('path');
+
+module.exports = {
+    'config':          path.resolve('config.json'),
+    'migrations-path': path.resolve('lib', 'migrations'),
+    'models-path':     path.resolve('lib', 'models'),
+    'url':             'change this'
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index beece7d..f2b469e 100644
--- a/README.md
+++ b/README.md
@@ -125,6 +125,10 @@ Third-party integration api key settings
 | imgur | `config.json` | for image upload |
 | google drive, dropbox | `public/js/common.js` | for export and import |
 
+DB migration
+---
+Modify the file named `.sequelizerc`, change the value of the variable `url` with your db connection string.  
+And run `node_modules/.bin/sequelize db:migrate`, that's it!
 
 Operational Transformation
 ---
diff --git a/lib/migrations/20160515114000-user-add-tokens.js b/lib/migrations/20160515114000-user-add-tokens.js
new file mode 100644
index 0000000..3af490a
--- /dev/null
+++ b/lib/migrations/20160515114000-user-add-tokens.js
@@ -0,0 +1,15 @@
+"use strict";
+
+module.exports = {
+    up: function (queryInterface, Sequelize) {
+        queryInterface.addColumn('Users', 'accessToken', Sequelize.STRING);
+        queryInterface.addColumn('Users', 'refreshToken', Sequelize.STRING);
+        return;
+    },
+
+    down: function (queryInterface, Sequelize) {
+        queryInterface.removeColumn('Users', 'accessToken');
+        queryInterface.removeColumn('Users', 'refreshToken');
+        return;
+    }
+};
\ No newline at end of file
diff --git a/lib/models/user.js b/lib/models/user.js
index 2323dc9..64173cb 100644
--- a/lib/models/user.js
+++ b/lib/models/user.js
@@ -26,6 +26,9 @@ module.exports = function (sequelize, DataTypes) {
         },
         accessToken: {
             type: DataTypes.STRING
+        },
+        refreshToken: {
+            type: DataTypes.STRING
         }
     }, {
         classMethods: {
diff --git a/package.json b/package.json
index 3ecaa84..bacd233 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
     "request": "^2.72.0",
     "reveal.js": "3.2.0",
     "sequelize": "^3.21.0",
+    "sequelize-cli": "^2.4.0",
     "shortid": "2.2.6",
     "socket.io": "1.4.5",
     "sqlite3": "^3.1.3",