message: ADD comment about
diff: token: ${{ secrets.GITHUB_TOKEN }}
  ```
  -We use [GitHub's action toolkit](https://github.com/actions/toolkit/blob/master/README.md#packages)
  -
  ## Usage (all options)
  ```yaml
  @@ -64,6 +62,12 @@ However if you need to be able to run this action on forked PRs you can't make i
  appCode: appcodehere
  ```
  +## Checkout depth
  +
  +In the v2 version of the `actions/checkout` action, there's no git history. Chromatic needs the git history in order to find the base-build.
  +
  +Add `fetch-depth: 0` to add full history, see: https://github.com/actions/checkout#whats-new
  +
  ## Development
  ### Publish to a distribution branch
  