diff --git a/.eslintrc.js b/.eslintrc.js
index b5349d2de0a1ff..2e92b495691873 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -321,6 +321,7 @@ module.exports = {
 					...[
 						'BorderBoxControl',
 						'BorderControl',
+						'BoxControl',
 						'ComboboxControl',
 						'CustomSelectControl',
 						'DimensionControl',
diff --git a/packages/components/src/box-control/README.md b/packages/components/src/box-control/README.md
index 2fd214b79157f7..b03b03a85466ae 100644
--- a/packages/components/src/box-control/README.md
+++ b/packages/components/src/box-control/README.md
@@ -100,3 +100,10 @@ A handler for onMouseOver events.
 A handler for onMouseOut events.
 
 -   Required: No
+
+### `__next40pxDefaultSize`: `boolean`
+
+Start opting into the larger default size that will become the default size in a future version.
+
+-   Required: No
+-   Default: `false`