diff --git a/README.md b/README.md
index de4b932..f3c2393 100644
--- a/README.md
+++ b/README.md
@@ -6,3 +6,8 @@ Local includes and excludes in `/etc/backup/local.config` or `/etc/backup/local.
 * `backup $REPO local` for local backup to repo configured by 
 * `backup $REPO monitor $HOST $WARN_HOURS $CRIT_HOURS` for Nagios/Icinga checks of backups
 * `backup $REPO $ARGUMENTS` for invoking restic with $ARGUMENTS for the repository
+
+In `local.config`:
+* `BACKUP_HOSTNAME` is the name your host will show up as in restic
+* `BACKUP_DIR` is the root of the directory you want to back up
+* `HEALTHCHECK_URL` is an optional URL to [healthchecks.io](https://healthchecks.io/checks/) (comment out if you don't need it)