clarify docs

Author: lovasoa

configuration.md

@@ -18,7 +18,7 @@ Here are the available configuration options and their default values:
 | `database_connection_acquire_timeout_seconds` | 10                                                          | How long to wait when acquiring a database connection from the pool before giving up and returning an error.                                                                                                                                           |
 | `sqlite_extensions`                           |                                                             | An array of SQLite extensions to load, such as `mod_spatialite`                                                                                                                                                                                        |
 | `web_root`                                    | `.`                                                         | The root directory of the web server, where the `index.sql` file is located.                                                                                                                                                                           |
-| `site_prefix`                                 | `/`                                                         | Must end with a `/`. The site prefix (useful for hosting behind a reverse proxy). |
+| `site_prefix`                                 | `/`                                                         | Base path of the site. If you want to host SQLPage at `https://example.com/sqlpage/`, set this to `/sqlpage/`. When using a reverse proxy, this allows hosting SQLPage together with other applications on the same subdomain. |
 | `configuration_directory`                     | `./sqlpage/`                                                | The directory where the `sqlpage.json` file is located. This is used to find the path to `templates/`, `migrations/`, and `on_connect.sql`. Obviously, this configuration parameter can be set only through environment variables, not through the `sqlpage.json` file itself in order to find the `sqlpage.json` file. Be careful not to use a path that is accessible from the public WEB_ROOT |
 | `allow_exec`                                  | false                                                       | Allow usage of the `sqlpage.exec` function. Do this only if all users with write access to sqlpage query files and to the optional `sqlpage_files` table on the database are trusted.                                                                  |
 | `max_uploaded_file_size`                      | 5242880                                                     | Maximum size of uploaded files in bytes. Defaults to 5 MiB.                                                                                                                                                                                            |