diff --git a/README.md b/README.md
index 364bfa8..803c12d 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ First of all you have to add `react-toolbox-themr` to your project as a developm
 $ yarn add --dev react-toolbox-themr
 ```
 
-Once installed you can define the configuration in the `package.json` file of your project or through the `--config <path/to/json>` option. If you want to use your `package.json` to store configuration, the `reactToolbox` key should be used on the top level to find your settings:
+Once installed you can define the configuration in the `package.json` file of your project or through the `--config <path/to/json>` option (Note that if used with separate config file, the `reactToolbox` key should be omitted). If you want to use your `package.json` to store configuration, the `reactToolbox` key should be used on the top level to find your settings:
 
 ```json
 "reactToolbox": {