diff --git a/backend/README.md b/backend/README.md
index 6642af5..2799c59 100644
--- a/backend/README.md
+++ b/backend/README.md
@@ -24,3 +24,14 @@ To get the `HEAD` of a requested branch, Gitache sends a request to the
 requested service's API. To prevent running into rate limiting issues with the
 GitHub API, an OAuth2 App should be created and the client ID and secret can be
 set via the `GITHUB_CLIENT_ID` and `GITHUB_CLIENT_SECRET` environment variables.
+
+## Variables
+
+| Environment Variable   | CLI Flag         | Description                     |
+| ---                    | ---              | ---                             |
+| `GITHUB_CLIENT_SECRET` | `--gh-secret`    | GitHub OAuth2 secret (optional) |
+| `GITHUB_CLIENT_ID`     | `--gh-id`        | GH OAuth2 Client ID (optional)  |
+| `CF_ZONE_IDENT`        | `--cf-zone`      | Cloudflare Zone identifier      |
+| `CF_AUTH_USER`         | `--cf-auth-user` | CF API User (`X-Auth-Email`)    |
+| `CF_AUTH_KEY`          | `--cf-auth-key`  | CF API Key (`X-Auth-Key`)       |
+| `HOSTNAME`             | `--hostname`     | Hostname (default: `gitcdn.tk`) |