CHANGELOG.md in flexdot-2.0.0 vs CHANGELOG.md in flexdot-3.0.0

@@ -1,29 +1,68 @@
+## 3.0.0
+
+### Breaking Changes
+
+Revert 'Add default_index option #2'. Please follow the instructions below to migrate:
+
+First, modify your Rakefile as follows:
+
+```diff
+require 'flexdot'
+
+Flexdot.setup(
++   home_dir: '..'
+-   home_dir: '..',
+-   default_index: 'macOS'
+)
+
++ task default: 'install:macOS'
+```
+
+Then, update flexdot:
+
+```
+$ bundle update flexdot
+```
+
+Now you can run the following command to install the default index dotfiles:
+
+```
+$ rake
+```
+
 ## 2.0.0
 
 ### Breaking Changes
 
-v1.0.x
+- Change the syntax of configuration in the `Rakefile`
 
+### Enchancements
+
+- Add `default_index` option fixes #2
+- Option renaming and simplification by default value
+
+### Migrating from v1.0.x
+
+First, you need to rewrite the `Rakefile` configuration to the v2.0.0 syntax.
+
 ```ruby
-# Rakefile
+# v1.0.x
 Flexdot.install_tasks(
   target_dir: '/home/username',
   base_dir: '.'
 )
 ```
 
-v2.0.0
-
 ```ruby
+# v2.0.0
 Flexdot.setup(
   home_dir: '/home/username',
   dotfiles_dir: '.'
 )
 ```
 
-### Enchancements
+Note that If the `dotfiles_dir` option is `'.'` (current directory) , you can omit it.
 
-- Add default_index option fixes #2
-- Option renaming and simplification by default value
+Then, update flexdot to v2.0.0 and you're done.
 
-Please refer to README.md for details.
+    $ bundle update flexdot