diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5b45770..9a27a4d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -61,7 +61,7 @@ start docs\_build\index.html
 3. Open http://localhost:42001/panel-service/panels/hello_panel/ in your browser
 4. If there is an error about missing imports (especially nipanel), execute this
    command (from the nipanel-python directory) to install the dependencies into the venv: 
-   `%localappdata%\Temp\python_panel_service_venv\Scripts\python.exe -m pip install .\[examples,dev]`,
+   `%localappdata%\Temp\python_panel_service_venv\Scripts\python.exe -m pip install . streamlit-echarts>=0.4.0`,
     then restart the PythonPanelService and re-run hello.py.
 
 You can see all running panels (and stop them) at: http://localhost:42001/panel-service/
diff --git a/examples/hello/hello.py b/examples/hello/hello.py
index ad2d97a..a8b8cd6 100644
--- a/examples/hello/hello.py
+++ b/examples/hello/hello.py
@@ -7,6 +7,10 @@
 panel_script_path = Path(__file__).with_name("hello_panel.py")
 panel = nipanel.create_panel(panel_script_path)
 
-panel.set_value("hello_string", "Hello, World!")
+index = 0
+while True:
+    panel.set_value("hello_string", f"Hello, World! {index}")
+    index += 1
+    print(f"...{index}")
 
 print(f"Panel URL: {panel.panel_url}")