docs/MessageRequest.md in bandwidth-sdk-11.0.0.pre.beta.1 vs docs/MessageRequest.md in bandwidth-sdk-11.0.0.pre.beta.1.1

@@ -9,10 +9,10 @@
 | **from** | **String** | One of your telephone numbers the message should come from in E164 format. |  |
 | **text** | **String** | The contents of the text message. Must be 2048 characters or less. | [optional] |
 | **media** | **Array<String>** | A list of URLs to include as media attachments as part of the message. Each URL can be at most 4096 characters. | [optional] |
 | **tag** | **String** | A custom string that will be included in callback events of the message. Max 1024 characters. | [optional] |
 | **priority** | [**PriorityEnum**](PriorityEnum.md) |  | [optional] |
-| **expiration** | **String** | A string with the date/time value that the message will automatically expire by. This must be a valid RFC-3339 value, e.g., 2021-03-14T01:59:26Z or 2021-03-13T20:59:26-05:00. | [optional] |
+| **expiration** | **Time** | A string with the date/time value that the message will automatically expire by. This must be a valid RFC-3339 value, e.g., 2021-03-14T01:59:26Z or 2021-03-13T20:59:26-05:00. Must be a date-time in the future. | [optional] |
 
 ## Example
 
 ```ruby
 require 'bandwidth-sdk'