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+## Usage
+
+```bash
+4r-feed -- --help
+Help Options:
+  -h, --help
+    Show option summary.
+  --help-all
+    Show all help options.
+
+Application Options:
+  --port :: int
+    The port the app should listen for connections on (for http)
+    default: 3000
+  --host :: text
+    Host preference (for http)
+    default: "*4"
+  --socket :: text
+    The UNIX domain socket path the app should listen for connections on (for
+    unix)
+    default: "wai.sock"
+  --protocol :: text
+    The protocol for the server. One of: http, cgi, unix, activate, http+tls,
+    unix+tls, activate+tls
+    default: "http"
+  --tlskey :: text
+    Path to the TLS private key file for +tls protocols
+    default: ""
+  --tlscert :: text
+    Path to the TLS certificate bundle file for +tls protocols
+    default: ""
+  --graceful :: text
+    Graceful shutdown mode. One of: none, serve-normally, serve-503
+    default: "serve-normally"
+  --devlogging :: maybe<bool>
+    Whether development logging should be enabled
+```
+
+Env variables:
+
+- `4R_FEED_CACHE` is number of seconds of cache validity. Default = 3600
+- `4RUM_BASE_URL` is base URL for performing requests to 4RUM API. Default = `http://4rum.i2p:80/`
+- `I2P_HTTP_PROXY` is address of I2P router. Will be used if `4RUM_BASE_URL`'s host ends with `.i2p`. Default = `127.0.0.1:4444`
+
+## Create a docker image
+
+```bash
+$ nix bundle --bundler github:NixOS/bundlers#toDockerImage .#packages.x86_64-linux._4r-feed
+$ ls
+4r  4r-api  4r-feed  4r-feed-0.1.0.tar.gz  README.md  flake.lock  flake.nix  nix
+```
+
+`4r-feed-$VERSION.tar.gz` is a symbolic link to Docker image of `4r-feed`.