Mention pin

Author: loomchild

README.md

@@ -7,6 +7,9 @@ It works just as well with [Podman](https://podman.io/) volumes, just prefix eac
 > [!WARNING]
 > Make sure no container is using the volume before backup or restore, otherwise your data might be damaged. See [Miscellaneous](#miscellaneous) for instructions.
 
+> [!TIP]
+> I am doing my best to keep this utility backwards-compatible. However, if you are using it in production environment and you want to be sure that it doesn't break with the future updates, request a specific image digest, e.g.: `docker run -v [volume-name]:/volume --rm --log-driver none loomchild/volume-backup@sha256:d598345843d8eb20e4b0da331d538eb9158b70bcaff56f7ba09f5ce1b6498019 backup > [archive-path]`. You can find the available digests on Docker Hub or GHCR.
+
 > [!TIP]
 > When using docker-compose, make sure to backup and restore volume labels. See [Miscellaneous](#miscellaneous) for more information.