update documentation.

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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
 # hugo-alageek-theme
+
 A [Cocoa Enhaced](https://github.com/mtn/cocoa-eh-hugo-theme) based theme. It's rewritten with **Bootstrap 5**.
 
 ![](/images/screenshot.png)
@@ -8,6 +9,14 @@ Websites that are using hugo with alaGeek theme:
 * https://alageek.com
 * https://gokmengorgen.net
 
+
+## Bootstrap v5 Migration
+
+If you have Bootstrap v4 specific customizations on your theme, please
+take a look at [this documentation](https://getbootstrap.com/docs/5.0/migration/)
+or keep your theme in the old version.
+
+
 ## Features
 
 * Social media links on the footer:
@@ -32,6 +41,7 @@ Websites that are using hugo with alaGeek theme:
 * Pagination support in blog posts
 * General and post-specific Table of Contents support.
 
+
 ## Supported Languages
 
 * Catalan
@@ -41,6 +51,7 @@ Websites that are using hugo with alaGeek theme:
 * Spanish
 * Turkish
 
+
 ## Dependency versions
 
 * bootstrap: 5.0.1
@@ -48,12 +59,14 @@ Websites that are using hugo with alaGeek theme:
 * mathjax: ^3.0.0
 * progressively: 1.2.5
 
+
 ## Typography
 
 * Title: Merriweather Sans
 * Content: Merriweather
 * Code: Fira Code
 
+
 ## Updates
 
 ### Goldmark Compatibility
@@ -65,6 +78,7 @@ files. Please take a look at [this
 documentation](https://gohugo.io/getting-started/configuration-markup/) for more
 information.
 
+
 ## License
 
 Licensed under the MIT License. See the LICENSE.md file for more details.