diff --git a/build.js b/build.js
index 73b79ef..c26074d 100644
--- a/build.js
+++ b/build.js
@@ -1,4 +1,3 @@
-const fs = require('fs')
 const path = require('path')
 const rollup = require('rollup')
 const babel = require('rollup-plugin-babel')
@@ -21,6 +20,7 @@ async function build (options, _outputOptions) {
     const outputOptions = {
       format: _outputOptions.format,
       exports: 'named',
+      banner: banner,
       file: path.resolve(__dirname, _outputOptions.filename),
       name: 'VueLazyload'
     }
diff --git a/vue-lazyload.esm.js b/vue-lazyload.esm.js
index 60c2631..b661b19 100644
--- a/vue-lazyload.esm.js
+++ b/vue-lazyload.esm.js
@@ -1,3 +1,9 @@
+/*!
+ * Vue-Lazyload.js v1.3.4
+ * (c) 2021 Awe <hilongjw@gmail.com>
+ * Released under the MIT License.
+ */
+
 /*!
  * is-primitive <https://github.com/jonschlinkert/is-primitive>
  *
diff --git a/vue-lazyload.js b/vue-lazyload.js
index f1a4894..2d999a5 100644
--- a/vue-lazyload.js
+++ b/vue-lazyload.js
@@ -1,3 +1,8 @@
+/*!
+ * Vue-Lazyload.js v1.3.4
+ * (c) 2021 Awe <hilongjw@gmail.com>
+ * Released under the MIT License.
+ */
 !function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t="undefined"!=typeof globalThis?globalThis:t||self).VueLazyload={})}(this,(function(t){"use strict";
 /*!
    * is-primitive <https://github.com/jonschlinkert/is-primitive>