README.md in sidekiq-prometheus-exporter-0.1.16

- old
+ new

@@ -22,9 +22,10 @@
 - `REDIS_URL` - [RFC 3986 generic URI][1], exclusive with `REDIS_HOST`
 - `REDIS_HOST` - a Redis host, exclusive with `REDIS_URL` (default: `localhost`)
 
 Optional
 
+- `REDIS_SSL` - a flag to enable Redis SSL URL scheme (default: `false`)
 - `REDIS_PORT` - a Redis port (default: `6379`)
 - `REDIS_PASSWORD` - a Redis password (if you need one)
 - `REDIS_DB_NUMBER` - a Redis database number (default: `0`)
 - `REDIS_NAMESPACE` - a Redis [namespace][2] name (if you have separated sidekiq)
 - `REDIS_SENTINELS` - a list of comma separated Redis urls (like `REDIS_URL`, but for sentinels)