diff --git a/schemas/json/block.json b/schemas/json/block.json
index 7234f36a5e0ecb..e5e63df17d7324 100644
--- a/schemas/json/block.json
+++ b/schemas/json/block.json
@@ -556,10 +556,12 @@
 					}
 				},
 				"shadow": {
+					"default": false,
 					"description": "Allow blocks to define a box shadow.",
 					"oneOf": [
 						{
-							"type": "boolean"
+							"type": "boolean",
+							"description": "Defines whether a box shadow is enabled or not."
 						},
 						{
 							"type": "object"