diff --git a/README b/README
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diff --git a/README.md b/README.md
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+
+# ZFS-Backup
+
+The zfs backing-up tool. ha-ha.
+
+## Tools:
+
+- `zb-snap <volume>` creates a snapshot
+- `zb-cleanup <volume> <density>` destroys unnecessary snapshots
+- `zb-pull <volume> <remote_volume> <ssh_options>` pulls most recent snapshot of `remote_volume` to `volume`, using ssh called with `ssh_options`
+- `zb-cron` reads configuration from `/etc/zfs-backup.conf` and executes above 3 commands with config-specified parameters
diff --git a/zb-snap b/zb-snap
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--- a/zb-snap
+++ b/zb-snap
@@ -1,2 +1,8 @@
 #!/bin/sh
 
+if [ -z "$1" ] ; then
+	echo "usage: $0 <zfs_volume>" >&2
+	exit 1
+fi
+
+exec zfs snapshot "${1}@zb-`date '+%F %T %z' |tr + p`"