Commit 1234046

@@ -9,11 +9,28 @@ A Nix OCI image builder for Forgejo Actions.
 - Nix (with flakes and nix-command enabled)
 - Most components in [catthehacker/docker_images](https://github.com/catthehacker/docker_images) `act` image.
 
+## Tags
+
+Every published tag exists as a multi-architecture index and as one tag per
+architecture, so a single architecture stays pullable for debugging:
+
+| Index               | amd64                            | arm64                             |
+| ------------------- | -------------------------------- | --------------------------------- |
+| `latest`            | `latest-x86_64-linux`            | `latest-aarch64-linux`            |
+| `nixos-<version>`   | `nixos-<version>-x86_64-linux`   | `nixos-<version>-aarch64-linux`   |
+
+`<version>` is the `lib.version` of the nixpkgs revision the image is built
+from, so the versioned tags change whenever `flake.lock` is updated.
+
+Images are published to
+[docker.io](https://hub.docker.com/r/hpcesia/nix-act-image) and
+[git.trin.one](https://git.trin.one/GOI/nix-act-image).
+
 ## Usage
 
-This image use [nlewo/nix2container](https://github.com/nlewo/nix2container)
-to build OCI images from Nix expressions. You can use it to build and push
-images to a registry. Check it's documentation for more details.
+This image uses [nlewo/nix2container](https://github.com/nlewo/nix2container)
+to build OCI images from Nix expressions. Check its documentation for more
+details.
 
 ```sh
 # Test image