message: fix typo, add missing step
diff: @@ -10,17 +10,24 @@ Sign up for the [Google DistanceMatrix API](https://developers.google.com/maps/d
  Fill in the Google API key in `.env`.
  +Make sure you are using node version 16.
  +
  Install dependencies here and in `utility-emissions-channel/typescript_app` with
  ```
  npm install
  ```
  +Build the application:
  +```
  +npm run build
  +```
  +
  ## Trying it
  First generate one or more key pairs for encrypting and decrypting files on IPFS.
  ```
  -node ups.ts -generatekeypair user1 -generatekeypair user2
  +node ups.js -generatekeypair user1 -generatekeypair user2
  ```
  Run by giving a list of tracking numbers and/or using a file containing one tracking number per line and one or more public key for encryption with:
  