diff --git a/plugins/ui/src/deephaven/ui/components/radio_group.py b/plugins/ui/src/deephaven/ui/components/radio_group.py
index 311bff67f..70593df67 100644
--- a/plugins/ui/src/deephaven/ui/components/radio_group.py
+++ b/plugins/ui/src/deephaven/ui/components/radio_group.py
@@ -15,6 +15,7 @@
     # Validation
     NecessityIndicator,
     Orientation,
+    ValidationBehavior,
 )
 from .basic import component_element
 from ..elements import Element
@@ -33,7 +34,7 @@ def radio_group(
     name: str | None = None,
     is_required: bool | None = None,
     is_invalid: bool | None = None,
-    # validation_behaviour # omitted because validate is omitted
+    validation_behaviour: ValidationBehavior,
     # validate, # omitted because of synchronouse return
     label: Any | None = None,
     description: Any | None = None,
@@ -108,13 +109,15 @@ def radio_group(
         name: The name of the radio button, used when submitting and HTML form.
         is_required: Whether the radio button is required on the input before form submission.
         is_invalid: Whether the radio button is in an invalid state.
+        validation_behaviour: Whether to use native HTML form validation to prevent form submission when the value is missing or invalid, or mark the field as required or invalid via ARIA.
         label: The content to display as the label.
         description: A description for the field. Provides a hint such as specific requirements for what to choose.
         error_message: An error message for the field.
         label_position: The position of the label relative to the radio button.
         label_align: The horizontal alignment of the label relative to the radio button.
         necessity_indicator: Whether the required state should be shown as an icon or text.
-        contextual_help: A ContextualHelp element to place next to the label
+        contextual_help: A ContextualHelp element to place next to the label.
+        show_error_icon: Whether an error icon is rendered.
         on_change: Handler that is called when the radio button value changes.
         on_focus: Handler that is called when the radio button is focused.
         on_blur: Handler that is called when the radio button loses focus.