diff --git a/README.md b/README.md
index c40cab4..2cd5506 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,13 @@ pip install -e .
 voila --Voila.config_file_paths=./ OPTIMADE-Client.ipynb
 ```
 
+For development:
+
+```bash
+pip install -e .[dev]
+pre-commit install
+```
+
 ## Test and deploy
 
 Once the changes are made, push to `dev-dokku` server to see if the new changes work well by running: 
diff --git a/tools_optimade_client/upload.py b/tools_optimade_client/upload.py
index 179f7a8..a5644d1 100644
--- a/tools_optimade_client/upload.py
+++ b/tools_optimade_client/upload.py
@@ -14,6 +14,7 @@
 QE_INPUT_APP_URL_PROD = "https://qeinputgenerator.materialscloud.io"
 QE_INPUT_APP_URL_DEV = "https://qeinputgenerator.matcloud.xyz"
 
+
 class QEInputButton(ipw.HTML):
     """QE Input Generator upload button
 
@@ -67,7 +68,9 @@ def __init__(self, button_style: Union[ButtonStyle, str] = None, **kwargs) -> No
         else:
             self._button_style = ButtonStyle.DEFAULT
 
-        self._default_domain = QE_INPUT_APP_URL_DEV if DEVELOPMENT_MODE else QE_INPUT_APP_URL_PROD
+        self._default_domain = (
+            QE_INPUT_APP_URL_DEV if DEVELOPMENT_MODE else QE_INPUT_APP_URL_PROD
+        )
 
         kwargs.pop("value", None)
         super().__init__(