diff --git a/source/schemas/shopping/types/line_item.json b/source/schemas/shopping/types/line_item.json
index 0eba9ed05..c293d49e2 100644
--- a/source/schemas/shopping/types/line_item.json
+++ b/source/schemas/shopping/types/line_item.json
@@ -41,6 +41,15 @@
         "create": "omit",
         "update": "optional"
       }
+    },
+    "note": {
+      "type": "string",
+      "maxLength": 500,
+      "description": "Buyer-supplied free-text note for this line item (e.g., gift wrapping instructions, dietary preferences, engraving text). Business echoes the value in responses and MAY include it in order webhook payloads for downstream fulfillment.",
+      "ucp_request": {
+        "create": "optional",
+        "update": "optional"
+      }
     }
   }
 }