Update website/docs/en/guide/basic/cli.mdx

Author: Timeless0911

website/docs/en/guide/basic/cli.mdx

@@ -63,7 +63,7 @@ Options:
 ```
 
 :::note
-If the project does not provide an `rslib.config.*` file, the CLI falls back to a default single [lib](/config/lib/) configuration and applies all build options from the command line. You can still specify `--config` later once you need more complex setups.
+If the [Rslib configuration file](/guide/basic/configure-rslib#configuration-file) is not present in your project, the CLI will automatically use the default configuration containing only a single [lib](/config/lib/) and apply all build options from the command line. You can add a configuration file once you need a more complex configuration or want to build outputs in multiple formats.
 :::
 
 ### Environment variables