Update README.md

README.md

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 ## CastleCSS Framework
 The core files are part of the [CastleCSS Package](https://github.com/CastleCSS/castlecss)
 
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 ## How to install
 - Install via [npm](https://www.npmjs.com/): ```npm install castlecss-core```
 - Require it in your own npm package
@@ -19,6 +18,13 @@ CastleCSS is built so it's easy to update, you can just download make it your ow
 You can find the documentation and examples at http://www.castlecss.com and [castlecss-docs](https://github.com/CastleCSS/castlecss-docs)
 
 
+## Adjusting the variables
+Because of the unique update-able setup of CastleCSS you need a seperate variable file to overwrite the default CastleCSS variables. There are a few ways to do this: 
+
+- Use the [boilerplate](https://github.com/CastleCSS/castlecss-boilerplate/) which provides a variables.scss file
+- Copy variables.scss from /node_modules/castlecss-core/sass/variables.scss into your own scss folder and include it into your main.scss
+- Copy the example from the [documentation](http://castlecss.com/variables.html) into your own variables.scss and include it into your main.scss
+
 ## Basic structure
 The basis structure for your website should look similar like this: