Add more details

source/_components/recorder.markdown

@@ -9,11 +9,16 @@ sharing: true
 footer: true
 logo: home-assistant.png
 ha_category: "History"
-featured: false
-ha_release: "0.20"
+ha_release: pre 0.7
 ---
 
-The `recorder` component is storing details in the local database which then are handled by the [`history` component](/components/history/).
+The `recorder` component is storing details in a database which then are handled by the [`history` component](/components/history/).
+
+Home Assistant uses [SQLAlchemy](http://www.sqlalchemy.org/) as Object Relational Mapper (ORM). This means that you can now use **any** SQL backend for the recorder that is supported by SQLAlchemy, like [MySQL](https://www.mysql.com/), [MariaDB](https://mariadb.org/), or [PostgreSQL](https://www.postgresql.org/).
+
+The default database engine is [SQLite](https://www.sqlite.org/) which doesn't require any configuration. The database is stored in your Home Assistant configuration directory (`.homeassistant`) and called `home-assistant.db`.
+
+```bash
 
 To setup the `recorder` component in your installation, add the following to your `configuration.yaml` file:
 
@@ -26,4 +31,4 @@ recorder:
 Configuration variables:
 
 - **purge_days** (*Optional*): Delete events and states older than x days.
-
+- **db_url** (*Optional*): The URL which point to your database. Eg. `mysql://localhost/homeassistant`