Update README

README.md

@@ -40,11 +40,15 @@ Plug 'junegunn/vim-easy-align'
 call plug#end()
 ```
 
-Then `:PlugInstall` to install plugins. By default, plugins are installed in
-`plugged` directory under the first path in runtimepath at the point when
-`plug#begin()` is called. This is usually `~/.vim/plugged` (or `$HOME/vimfiles`
-on Windows) given that you didn't touch runtimepath before the call. You can
-explicitly set the location of the plugins with `plug#begin(path)` call.
+Then `:PlugInstall` to install plugins.
+
+### Plugin directory
+
+By default, plugins are installed in `plugged` directory under the first path in
+runtimepath at the point when `plug#begin()` is called. This is usually
+`~/.vim/plugged` (or `$HOME/vimfiles` on Windows) given that you didn't touch
+runtimepath before the call. You can explicitly set the location of the plugins
+with `plug#begin(path)` call.
 
 ### Commands