diff --git a/examples/reference/layouts/WidgetBox.ipynb b/examples/reference/layouts/WidgetBox.ipynb
index bc20ae886f..95470469fe 100644
--- a/examples/reference/layouts/WidgetBox.ipynb
+++ b/examples/reference/layouts/WidgetBox.ipynb
@@ -21,6 +21,7 @@
     "For layout and styling related parameters see the [customization user guide](../../user_guide/Customization.ipynb).\n",
     "\n",
     "* **``objects``** (list): The list of objects to display in the WidgetBox. Should not generally be modified directly except when replaced in its entirety.\n",
+    "* **``disabled``** (boolean, default=False): Allow to disable all the widgets displayed in the WidgetBox.\n",
     "\n",
     "___"
    ]