diff --git a/openapi/api.yaml b/openapi/api.yaml
index 8cfc1cd9..10fdb231 100644
--- a/openapi/api.yaml
+++ b/openapi/api.yaml
@@ -686,6 +686,7 @@ paths:
               code: accountCode,
               firstName: 'Benjamin',
               lastName: 'Du Monde',
+              preferredTimeZone: 'America/Chicago',
               address: {
                 street1: '900 Camp St',
                 city: 'New Orleans',
@@ -714,6 +715,7 @@ paths:
                   "code": account_code,
                   "first_name": "Benjamin",
                   "last_name": "Du Monde",
+                  "preferred_time_zone": "America/Chicago",
                   "acquisition": {
                       "campaign": "podcast-marketing",
                       "channel": "social_media",
@@ -749,6 +751,7 @@ paths:
                   Code = accountCode,
                   FirstName = "Benjamin",
                   LastName = "Du Monde",
+                  PreferredTimeZone = "America/Chicago",
                   Address = new Address()
                   {
                       City = "New Orleans",
@@ -779,6 +782,7 @@ paths:
               code: account_code,
               first_name: "Benjamin",
               last_name: "Du Monde",
+              preferred_time_zone: "America/Chicago",
               acquisition: {
                 campaign: "podcast-marketing",
                 channel: "social_media",
@@ -817,6 +821,7 @@ paths:
               accountReq.setCode(accountCode);
               accountReq.setFirstName("Aaron");
               accountReq.setLastName("Du Monde");
+              accountReq.setPreferredTimeZone("America/Chicago");
 
               address.setStreet1("900 Camp St.");
               address.setCity("New Orleans");
@@ -843,6 +848,7 @@ paths:
                   "code" => $account_code,
                   "first_name" => "Douglas",
                   "last_name" => "DuMonde",
+                  "preferred_time_zone" => "America/Chicago",
                   "shipping_addresses" => [
                       [
                           "first_name" => "Douglas",
@@ -872,17 +878,17 @@ paths:
       - lang: Go
         source: "accountReq := &recurly.AccountCreate{\n\tCode:      &accountCode,\n\tFirstName:
           recurly.String(\"Isaac\"),\n\tLastName:  recurly.String(\"Du Monde\"),\n\tEmail:
-          \    recurly.String(\"isaac@example.com\"),\n\tBillingInfo: &recurly.BillingInfoCreate{\n\t\tFirstName:
-          recurly.String(\"Isaac\"),\n\t\tLastName:  recurly.String(\"Du Monde\"),\n\t\tAddress:
-          &recurly.AddressCreate{\n\t\t\tPhone:      recurly.String(\"415-555-5555\"),\n\t\t\tStreet1:
-          \   recurly.String(\"400 Alabama St.\"),\n\t\t\tCity:       recurly.String(\"San
-          Francisco\"),\n\t\t\tPostalCode: recurly.String(\"94110\"),\n\t\t\tCountry:
-          \   recurly.String(\"US\"),\n\t\t\tRegion:     recurly.String(\"CA\"),\n\t\t},\n\t\tNumber:
-          recurly.String(\"4111111111111111\"),\n\t\tMonth:  recurly.String(\"12\"),\n\t\tYear:
-          \  recurly.String(\"22\"),\n\t\tCvv:    recurly.String(\"123\"),\n\t},\n}\n\naccount,
-          err := client.CreateAccount(accountReq)\nif e, ok := err.(*recurly.Error);
-          ok {\n\tif e.Type == recurly.ErrorTypeValidation {\n\t\tfmt.Printf(\"Failed
-          validation: %v\", e)\n\t\treturn nil, err\n\t}\n\tfmt.Printf(\"Unexpected
+          \    recurly.String(\"isaac@example.com\"),\n\tPreferredTimeZone: recurly.String(\"America/Los_Angeles\"),\n\tBillingInfo:
+          &recurly.BillingInfoCreate{\n\t\tFirstName: recurly.String(\"Isaac\"),\n\t\tLastName:
+          \ recurly.String(\"Du Monde\"),\n\t\tAddress: &recurly.AddressCreate{\n\t\t\tPhone:
+          \     recurly.String(\"415-555-5555\"),\n\t\t\tStreet1:    recurly.String(\"400
+          Alabama St.\"),\n\t\t\tCity:       recurly.String(\"San Francisco\"),\n\t\t\tPostalCode:
+          recurly.String(\"94110\"),\n\t\t\tCountry:    recurly.String(\"US\"),\n\t\t\tRegion:
+          \    recurly.String(\"CA\"),\n\t\t},\n\t\tNumber: recurly.String(\"4111111111111111\"),\n\t\tMonth:
+          \ recurly.String(\"12\"),\n\t\tYear:   recurly.String(\"22\"),\n\t\tCvv:
+          \   recurly.String(\"123\"),\n\t},\n}\n\naccount, err := client.CreateAccount(accountReq)\nif
+          e, ok := err.(*recurly.Error); ok {\n\tif e.Type == recurly.ErrorTypeValidation
+          {\n\t\tfmt.Printf(\"Failed validation: %v\", e)\n\t\treturn nil, err\n\t}\n\tfmt.Printf(\"Unexpected
           Recurly error: %v\", e)\n\treturn nil, err\n}\nfmt.Printf(\"Created Account:
           %s\", account.Id)"
   "/sites/{site_id}/accounts/{account_id}":
@@ -6175,6 +6181,7 @@ paths:
           - item
           - plan
           - subscription
+          - charge
       responses:
         '200':
           description: A list of the site's custom field definitions.
@@ -17444,6 +17451,7 @@ components:
           - item
           - plan
           - subscription
+          - charge
         name:
           type: string
           title: Name
@@ -18696,6 +18704,8 @@ components:
           format: date-time
           title: End date
           description: If this date is provided, it indicates the end of a time range.
+        custom_fields:
+          "$ref": "#/components/schemas/CustomFields"
         created_at:
           type: string
           format: date-time
@@ -18890,6 +18900,8 @@ components:
           format: date-time
           title: End date
           description: If this date is provided, it indicates the end of a time range.
+        custom_fields:
+          "$ref": "#/components/schemas/CustomFields"
       required:
       - currency
       - unit_amount
diff --git a/recurly/resources.py b/recurly/resources.py
index b01fec03..21aae562 100644
--- a/recurly/resources.py
+++ b/recurly/resources.py
@@ -1343,6 +1343,8 @@ class LineItem(Resource):
         The reason the credit was given when line item is `type=credit`.
     currency : str
         3-letter ISO 4217 currency code.
+    custom_fields : :obj:`list` of :obj:`CustomField`
+        The custom fields will only be altered when they are included in a request. Sending an empty array will not remove any existing values. To remove a field send the name with a null or empty value.
     description : str
         Description that appears on the invoice. For subscription related items this will be filled in automatically.
     discount : float
@@ -1439,6 +1441,7 @@ class LineItem(Resource):
         "credit_applied": float,
         "credit_reason_code": str,
         "currency": str,
+        "custom_fields": ["CustomField"],
         "description": str,
         "discount": float,
         "end_date": datetime,