diff --git a/docs/docs/tutorials/installation.mdx b/docs/docs/tutorials/installation.mdx
index aef3c6cae..10063f7c4 100644
--- a/docs/docs/tutorials/installation.mdx
+++ b/docs/docs/tutorials/installation.mdx
@@ -142,6 +142,8 @@ yarn add @egjs/svelte-flicking
## CDN Links
+Unlike individual or internal cases, CDN has unpredictable problems with services, so it is better to use your own files.
+
### packaged(with dependencies)
```html
diff --git a/docs/docs/tutorials/polyfills.mdx b/docs/docs/tutorials/polyfills.mdx
index 665d53c83..b2b367f57 100644
--- a/docs/docs/tutorials/polyfills.mdx
+++ b/docs/docs/tutorials/polyfills.mdx
@@ -6,6 +6,7 @@ custom_edit_url: null
sidebar_position: 6
---
+### Before
Flicking is based on es5 and additionally needs es6 Promise to work properly.
es5 is basically supported on IE9+ ([Source](http://kangax.github.io/compat-table/es5/))
So, only es6 Promise is needed to run Flicking on the older browsers.
@@ -14,4 +15,28 @@ So, only es6 Promise is needed to run Flicking on the older browsers.
```
+Adding the above script will make Flicking run on the older browsers.
+
+### After
+
+
+Flicking is based on es5 and additionally needs es6 Promise to work properly.
+es5 is basically supported on IE9+ ([Source](http://kangax.github.io/compat-table/es5/))
+So, only es6 Promise is needed to run Flicking on the older browsers.
+
+* How to use it via CDN (For personal or internal use)
+```html
+
+```
+* How to use it yourself (Unlike individual or internal cases, CDN has unpredictable problems with services, so it is better to use your own files.)
+```
+# Download
+https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.auto.js
+```
+* How to use it via module (The pollution of the global scope)
+```js
+require('es6-promise').polyfill();
+```
+
+
Adding the above script will make Flicking run on the older browsers.
diff --git a/docs/docs/tutorials/quick-start.mdx b/docs/docs/tutorials/quick-start.mdx
index 4d2beef2f..36aa8aa9f 100644
--- a/docs/docs/tutorials/quick-start.mdx
+++ b/docs/docs/tutorials/quick-start.mdx
@@ -23,7 +23,7 @@ import TabItem from '@theme/TabItem';
]}>
-Add the script/CSS to the page.
+Add the script/CSS to the page. (Unlike individual or internal cases, CDN has unpredictable problems with services, so it is better to use your own files.)
```html