link to unstable features from node docs (#246)

runtime/manual/node/index.md

@@ -4,9 +4,19 @@ Many people will want to leverage code and libraries that are built for
 [Node](https://nodejs.org/), in particular the large set of packages available
 on the [npm](https://npmjs.com/) registry.
 
-There are currently several ways to do this:
+There are currently several ways to do this - check out the links below to learn
+more about these methods.
 
 - Using [`npm:` specifiers](./npm_specifiers.md) and
   [`node:` specifiers](./node_specifiers.md)
 - [package.json compatibility](./package_json.md)
 - Using [CDNs](./cdns.md)
+
+## Unstable compatibility features
+
+Node and npm compatiblity is an ongoing project for the Deno team. As such,
+there are a number of unstable features aimed at improving compatibility that
+you may want to reference. Please check out the
+[unstable feature flags](/runtime/manual/tools/unstable_flags) documentation for
+options that may improve your project's compatibility with code written for
+Node.js.