-the relative path must be prefixed with special data `_BASE_PATH_`:
-`($data['_BASE_PATH_'] ?? '') . '/' . PluginManager::$PLUGINS_PATH . '/mything/picture.png`.
+the relative path must be prefixed with special data:
+
+ * if it's a link that will need to be processed by Shaarli, use `_BASE_PATH_`:
+ for e.g. `$data['_BASE_PATH_'] . '/admin/tools`.
+ * if you want to include an asset, you need to add the root URL (base path without `/index.php`, for people using Shaarli without URL rewriting), then use `_ROOT_PATH_`:
+ for e.g
+`$['_ROOT_PATH_'] . '/' . PluginManager::$PLUGINS_PATH . '/mything/picture.png`.