Docs.

Author: gajus

README.md

@@ -12,6 +12,7 @@ Seamless mapping of class names to CSS modules inside of React components.
         - [`keepOriginal`](#keeporiginal)
         - [`errorNotFound`](#errornotfound)
 - [SASS, SCSS, LESS and other CSS Preprocessors](#sass-scss-less-and-other-css-preprocessors)
+- [Global CSS](#global-css)
 - [Multiple CSS Classes](#multiple-css-classes)
 
 ## What's the Problem?
@@ -163,6 +164,20 @@ Throws an error when class name cannot be mapped to a CSS Module. Default: `fals
 }
 ```
 
+## Global CSS
+
+CSS Modules does not restrict you from using global CSS.
+
+```css
+:global .foo {
+
+}
+```
+
+When using global CSS, you need to enable [`keepOriginal`](#keeporiginal) option.
+
+Use global CSS with caution. With CSS Modules, there are only a handful of valid use cases for global CSS (e.g. [normalization](https://github.com/necolas/normalize.css/)).
+
 ## Multiple CSS Classes
 
 CSS modules promote composition pattern, i.e. every CSS class that is used in a component should define all properties required to describe the element, e.g.