Update shared SQL information

en/SQLDatabase.md

@@ -8,17 +8,22 @@ since: 3.6
 
 JabRef is able to support collaborative work using a shared SQL database.
 This feature is available since JabRef 3.6.
-If you used to work with an older version of JabRef, please refer to [SQLDatabaseMigration](SQLDatabaseMigration) for information how to update your data.
 
 ## Usage
 
 To use this feature you have to connect to a remote database. 
 To do so you have to open **File** in the menu bar and then click the **Connect to shared database** item.
 The **Connect to shared database** dialog will open and you will have to fill in the shared's database connection settings.
-Under the field **Database type** you can choose between PostgreSQL (at least version 9.1), MySQL (not recommended, because there is no life synchronization), and Oracle depending on your shared database.
+Under the field **Database type** you can choose between PostgreSQL (at least version 9.1), MySQL (at least 5.5, not recommended, because there is no live synchronization), and Oracle depending on your shared database.
 Then, you have to fill out the remaining fields with the according information.
 If you like you can save your password by clicking the **Remember password?** checkbox.
 
+### SSL configuration
+Since version 5.0 JabRef supports secure SSL connection to the database. For PostgreSQL make sure the server supports SSL and you have correctly setup the [certificates](https://www.postgresql.org/docs/current/static/ssl-tcp.html).
+Then [convert the client certificates](https://jdbc.postgresql.org/documentation/head/ssl-client.html) into a java readable format and import them into a (custom) keystore.
+For MySQL the procedure is similar. [Setting up MySQL with SSL](https://dev.mysql.com/doc/refman/8.0/en/using-encrypted-connections.html) and [converting the certificates](https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-reference-using-ssl.html) for the java keystore. However, it has only been tested with PostgreSQL.
+Once the certificates are imported into the keystore, specify the path to the keystore file in the connection dialog and the password for acessing the keystore.
+
 ![Screenshot of Connect to shared database dialog](./images/open-shared-database-dialog.png)
 
 After connecting to your shared database, your main window should look like this: