Update README.md

README.md

@@ -3,6 +3,8 @@ seiya.vim
 
 ## Usage
 
+### Commands
+
 #### Enable
 
 `:SeiyaEnable`
@@ -13,10 +15,23 @@ seiya.vim
 
 If backgroung color is not updated, try `colorshame [your_colorscheme]`
 
+### Configuration
+
 #### Automatically enable when vim starts
 
-Add this line in your vimrc.
+Add this line in your vimrc. By default, this option is disabled.
 
 ```vim
 let g:seiya_auto_enable=1
 ```
+
+#### Change highlight groups to clear
+
+This option is helpful for [Neovim](https://neovim.io/) users.
+
+```vim
+" Default value: ['ctermbg']
+let g:seiya_target_groups = has('nvim') ? ['guibg'] : ['ctermbg']
+```
+
+In Neovim with true-color terminal, this plugin does not work since gui\* highlight groups are used even when it's running on terminal. This option solves this problem.