A few clarifications.

Author: robinheghan

README.md

@@ -17,10 +17,12 @@ The end goal is for the entire compiler to be written in Gren.
 To build the compiler:
 
 1. Use `devbox run prepare-deps` to setup the required dependencies. The first time you run this it might take a while.
-2. Build the compiler with `devbox run build`.
+2. Build the compiler with `devbox run build`. This will create a `cli.js` file and a `gren` executable in the project root directory.
 
-You can now execute the compiler with `node ./cli.js` or just `./cli.js`. The Gren-part of the compiler will download a pre-built
-binary of the Haskell-part from Github. If you want to run the compiler with the Haskell-part you've built yourself, set the path
-to the Haskell-binary in a `GREN_BIN` environment variable.
+You can now execute the Gren-part of the compiler with `node ./cli.js` or just `./cli.js`. This either requires `node` to be installed,
+or that you've entered the development shell by using `devbox shell`. The Gren-part of the compiler will by default download a pre-built
+binary of the Haskell-part from Github. If you want to run the compiler with the Haskell-part you've just built, set the path
+to the Haskell-binary in a `GREN_BIN` environment variable, like: `GREN_BIN=$PWD/gren node ./cli.js`.
 
-Don't forget to check the `scripts` defined in `devbox.json`. They can be executed using `devbox run <script>`.
+You might also want to study the scripts defined in `devbox.json`. You can execute one of these scripts by running
+`devbox run <script_name>`.