Regenerate site.

	go generate ./...

Author: dmitshur

index.md

@@ -22,7 +22,15 @@ Get or update GopherJS and dependencies with:
 go get -u github.com/gopherjs/gopherjs
 ```
 
-Now you can use  `gopherjs build [files]` or `gopherjs install [package]` which behave similar to the `go` tool. For `main` packages, these commands create a `.js` file and `.js.map` source map in the current directory or in `$GOPATH/bin`. The generated JavaScript file can be used as usual in a website. Use `gopherjs help [command]` to get a list of possible command line flags, e.g. for minification and automatically watching for changes. If you want to run the generated code with Node.js, see [this page](https://github.com/gopherjs/gopherjs/blob/master/doc/syscalls.md).
+Now you can use  `gopherjs build [files]` or `gopherjs install [package]` which behave similar to the `go` tool. For `main` packages, these commands create a `.js` file and `.js.map` source map in the current directory or in `$GOPATH/bin`. The generated JavaScript file can be used as usual in a website. Use `gopherjs help [command]` to get a list of possible command line flags, e.g. for minification and automatically watching for changes.
+
+If you want to use `gopherjs run` or `gopherjs test` to run the generated code locally, install Node.js 4.x and the module `source-map-support`:
+
+```
+npm install --global source-map-support
+```
+
+For system calls (file system access, etc.), see [this page](https://github.com/gopherjs/gopherjs/blob/master/doc/syscalls.md).
 
 *Note: GopherJS will try to write compiled object files of the core packages to your $GOROOT/pkg directory. If that fails, it will fall back to $GOPATH/pkg.*