diff --git a/README.md b/README.md
index d510663..c546afd 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,7 @@ The container is setup by setting [environment variables](https://docs.docker.co
 * `RESTIC_TAG` - Optional. To tag the images created by the container.
 * `NFS_TARGET` - Optional. If set the given NFS is mounted, i.e. `mount -o nolock -v ${NFS_TARGET} /mnt/restic`. `RESTIC_REPOSITORY` must remain it's default value!
 * `BACKUP_CRON` - A cron expression to run the backup. Default: `* */6 * * *` aka every 6 hours.
+* `RESTIC_FORGET_ARGS` - Optional. Only if specified `restic forget` is run with the given arguments after each backup. Example value: `-e "RESTIC_FORGET_ARGS=--keep-last 10 --keep-hourly=24 --keep-daily 7 --keep-weekly=52 --keep-monthly=12 --keep-yearly 100"`
 
 ## Volumes
 
@@ -74,5 +75,6 @@ Now you can simply specify the restic repository to be an [SFTP repository](http
 # TODO
 
 * Support AWS backups
-* Support second cron that runs `restic check` regularly
+* Support cron that runs `restic check` regularly
+* Support cron that runs `restic prune` regularly
 * Add testsetup based on docker-compose