diff --git a/README.md b/README.md
new file mode 100644
index 0000000..79d61dd
--- /dev/null
+++ b/README.md
@@ -0,0 +1,42 @@
+# Zero-Fuzz Docker Database Backup
+
+A simple tool to create backup of all databases on a host. Supports postgres and mysql/mariadb.
+
+Successor to [this script](https://kolaente.dev/konrad/docker-database-backup).
+
+## Usage
+
+Simply point it at your docker socket, mount a backup volume and be done:
+
+```
+docker run -v $PWD:/backups -v /var/run/docker.sock:/var/run/docker.sock kolaente/db-backup
+```
+
+The tool will find all database containers and create backups of them periodically. It will also discover new containers
+as they are started and won't try to back up containers which have gone away.
+
+When running, all backups for the current run are time-stamped into a sub folder of the backup directory (see below).
+
+## Config
+
+All config is done with environment variables.
+
+### `BACKUP_FOLDER`
+
+Where all backup files will be stored.
+
+Default: `/backups`
+
+### `BACKUP_INTERVAL`
+
+The interval at which backups will happen. Must be a parsable string
+as [time.Duration](https://pkg.go.dev/time#ParseDuration). Must be positive.
+
+Default: `3h`
+
+### `BACKUP_MAX`
+
+How many backups to keep. If more backups are stored in the backup folder, the oldest one will be removed until there
+are only as many as this config variabls.
+
+Default: `24`
diff --git a/config.go b/config.go
index c206078..2295ac2 100644
--- a/config.go
+++ b/config.go
@@ -23,14 +23,20 @@ var (
 	dumpTime time.Time
 )
 
+const (
+	envBackupFolder = `BACKUP_FOLDER`
+	envInterval     = `BACKUP_INTERVAL`
+	envMax          = `BACKUP_MAX`
+)
+
 func init() {
 	config = &conf{
 		Folder:     "/backups/",
 		Interval:   time.Hour * 6,
-		MaxBackups: 12,
+		MaxBackups: 24,
 	}
 
-	folder, has := os.LookupEnv("BACKUP_FOLDER")
+	folder, has := os.LookupEnv(envBackupFolder)
 	if has {
 		if !strings.HasSuffix(folder, "/") {
 			folder = folder + "/"