explicitly add rust as an install dependency
@@ -69,6 +69,8 @@ Get [Depot Tools](http://commondatastorage.googleapis.com/chrome-infra-docs/flat
You need [yarn](https://yarnpkg.com/lang/en/docs/install/) installed.
+You need [rust](https://www.rust-lang.org/en-US/install.html) installed.
+
Go to `src/` folder:
``` bash
cd src/
