Update README

Author: uduse

README.md

@@ -5,6 +5,7 @@
 ## Features
  - Syntax Highlighting
  - Keywords/Built-In Variables Autocompletion
+ - User-created Resources Autocompletion
  - Function/Control Snippets
  - Auto Indentation
 
@@ -20,12 +21,13 @@ Restart your Sublime and you're ready to rock!
 ### GameMaker: Studio 2
 - [Checkout my tutorial on setting up your GameMaker Studio: 2 for Sublime](http://code.uduse.com/2017/02/10/set-up-your-sublime-text-3-to-write-gamemaker-studio-2-codes/)!
 - Name your source file with extension ```gml```. For example, ```example.gml```. Syntax highlighting will be applied automatically. 
-- Partially keywords, built-in variables, and names of user created resources to trigger autocompletion.
+- Partially type keywords, built-in variables, and names of user-created resources to trigger autocompletion. To enable user-created resources completions, make sure your project root directory is opened in Sublime.
 - Partially type function names to trigger function snippets. If multiple parameters are avaliable, TAB (↹) to go to next one. Most of the built-in functions are avaliable as snippets. 
 - Other custom snippets are: ```for```, ```if```, ```else```, ```repeat```, ```switch```, ```while```, ```with```, and ```print``` that writes ```show_debug_message```.
 - To indent your gml file, use: ```Command Palette (⌘⇧P)  ➤  Indentation: Reindent Lines.```
 
 ### GameMaker: Studio 1.4 or earlier:
 - You need to copy & paste manually between Sublime and GameMaker: Studio.
 - Name your source file with extension ```gmll```, the extra 'l' stands for legacy. For example, ```example.gmll```.
+- User-created resources autocompletion is not supported.
 - Everything else is pretty much the same as GameMaker: Studio 2.