diff --git a/reflex/components/radix/themes/base.py b/reflex/components/radix/themes/base.py
index 3ef919c1a..4c4d5c85d 100644
--- a/reflex/components/radix/themes/base.py
+++ b/reflex/components/radix/themes/base.py
@@ -201,6 +201,7 @@ class ThemePanel(RadixThemesComponent):
 
     tag = "ThemePanel"
 
+    # Whether the panel is open. Defaults to False.
     default_open: Var[bool]
 
 
diff --git a/reflex/components/radix/themes/base.pyi b/reflex/components/radix/themes/base.pyi
index 5fc7795bb..fd6652500 100644
--- a/reflex/components/radix/themes/base.pyi
+++ b/reflex/components/radix/themes/base.pyi
@@ -705,6 +705,7 @@ class ThemePanel(RadixThemesComponent):
             *children: Child components.
             color: map to CSS default color property.
             color_scheme: map to radix color property.
+            default_open: Whether the panel is open. Defaults to False.
             style: The style of the component.
             key: A unique key for the component.
             id: The id for the component.