diff --git a/reference/customers.v3.yml b/reference/customers.v3.yml
index 42088fce6..47e7a345e 100644
--- a/reference/customers.v3.yml
+++ b/reference/customers.v3.yml
@@ -204,6 +204,13 @@ paths:
       responses:
         '200':
           $ref: '#/components/responses/CustomerCollectionResponse'
+        '422':
+          description: |
+            The optional filter parameter was not valid. This is the result of missing required fields, or of invalid data. See the response for more details.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
     post:
       description: |-
         Creates Customers. Create up to 10 customers in one call.
@@ -414,6 +421,12 @@ paths:
         '204':
           description: ''
           headers: {}
+        '422':
+          description: The `id:in` was not valid. This is the result of missing required fields, or of invalid data. See the response for more details. 
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Error'
   '/customers/addresses':
     get:
       description: Returns a list of Customer Addresses. Optional filter parameters can be passed in.