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

@@ -45,21 +45,21 @@
   home_dir: '/home/username',
 
   # (optional)
   # The dotfile directory path.
   # Default '.'.
-  dotfiles_dir: '.',
-
-  # (optional)
-  # The `rake install` command will be available to install the dotfile for the specified index file.
-  # Default nil.
-  #
-  # Note that the `rake install` command is always available if you have a single index file.
-  default_index: 'name_of_an_index_file'
+  dotfiles_dir: '.'
 )
 ```
 
+It is recommended that you add the Rakefile to `gitignore`:
+
+```
+# .gitignore
+Rakefile
+```
+
 Finally, run `rake -T` in the `$HOME/dotfiles` and make sure that the output is as follows:
 
     $ rake -T
     rake clear_backups
 
@@ -122,22 +122,24 @@
 
 ```ruby
 require 'flexdot'
 
 Flexdot.setup(
-  home_dir: '..',
-  default_index: 'macOS'
+  home_dir: '..'
 )
+
+# You can execute `install:macOS` when you run `rake` command
+# with no arguments by defining it as follows:
+task default: 'install:macOS'
 ```
 
 ### Available Commands
 
 When you run the `rake -T` command in that directory structure, you should have two installation commands available:
 
     $ rake -T
     rake clear_backups   # Clear all backups
-    rake install         # Install dotfiles for macOS
     rake install:macOS   # Install dotfiles for macOS
     rake install:ubuntu  # Install dotfiles for ubuntu
 
 ### Dotfile Index File
 
@@ -209,14 +211,14 @@
     restart.sh: .xkeysnail
     start.sh: .xkeysnail
     stop.sh: .xkeysnail
 ```
 
-### Installing dotfiles
+### Installing dotfiles for macOS
 
-    $ rake install
+    $ rake
 
-Or
+Or,
 
     $ rake install:macOS
 
 The following is the output result: