diff --git a/docs/examples/events/prevent.py b/docs/examples/events/prevent.py
index 66ffb034c..e8fd0de05 100644
--- a/docs/examples/events/prevent.py
+++ b/docs/examples/events/prevent.py
@@ -13,7 +13,7 @@ class PreventApp(App):
     def on_button_pressed(self) -> None:
         """Clear the text input."""
         input = self.query_one(Input)
-        with input.prevent(Input.Changed):  # (1)
+        with input.prevent(Input.Changed):  # (1)!
             input.value = ""
 
     def on_input_changed(self) -> None: