Updated installation instruction about Sass/SCSS support

README.md

@@ -69,7 +69,13 @@ go install
 ```
 
 **If you are a Windows user, substitute the `$HOME` environment variable above with `%USERPROFILE%`.**
-
+
+If you want to compile with Sass/SCSS support use `--tags extended` and make sure `CGO_ENABLED=1` is set in your go environment. If you don't want to have CGO enabled, you may use the following command to temporarily enable CGO only for hugo compilation:
+
+```bash
+CGO_ENABLED=1 go install --tags extended
+```
+
 ## The Hugo Documentation
 
 The Hugo documentation now lives in its own repository, see https://github.com/gohugoio/hugoDocs. But we do keep a version of that documentation as a `git subtree` in this repository. To build the sub folder `/docs` as a Hugo site, you need to clone this repo: