diff --git a/reference/carts.v3.yml b/reference/carts.v3.yml
index 4b611a6ef..19a629ca1 100644
--- a/reference/carts.v3.yml
+++ b/reference/carts.v3.yml
@@ -2420,6 +2420,22 @@ components:
         name:
           type: string
           description: Optionally, provide a value to override the product name.
+        weight:
+          type: number
+          description: Optionally, provide a value to override the product weight.
+        dimensions:
+          type: object
+          description: Optionally, provide a value to override the product dimensions.
+          properties:
+            height:
+              type: number
+              description: The custom height of the product.
+            width:
+              type: number
+              description: The custom width of the product.
+            depth:
+              type: number
+              description: The custom depth of the product.
         gift_wrapping:
           type: object
           properties:
@@ -2471,6 +2487,22 @@ components:
         name:
           type: string
           description: Optionally, provide a value to override the product name.
+        weight:
+          type: number
+          description: Optionally, provide a value to override the product weight.
+        dimensions:
+          type: object
+          description: Optionally, provide a value to override the product dimensions.
+          properties:
+            height:
+              type: number
+              description: The custom height of the product.
+            width:
+              type: number
+              description: The custom width of the product.
+            depth:
+              type: number
+              description: The custom depth of the product.
         option_selections:
           type: array
           description: Needed for Catalog V2.
@@ -2773,6 +2805,25 @@ components:
               type: string
               description: The item’s product name.
               example: T-Shirt
+            weight:
+              type: number
+              description: The weight is displayed here if the item has a custom dimension.
+              example: 1.2
+            dimensions:
+              type: object
+              properties:
+                height:
+                  type: number
+                  description: The height is displayed here if the item has a custom dimension.
+                  example: 2.0
+                width:
+                  type: number
+                  description: The width is displayed here if the item has a custom dimension.
+                  example: 2.1
+                depth:
+                  type: number
+                  description: The depth is displayed here if the item has a custom dimension.
+                  example: 2.2
             url:
               description: The product URL.
               type: string