Update Message.md

Author: cakedan

docs/resources/Message.md

@@ -793,7 +793,7 @@ Files must be attached using a `multipart/form-data` body as described in [Uploa
 | files[n]?\*        | file contents                                                                                | Contents of the file being sent. See [Uploading Files](#DOCS_REFERENCE/uploading-files)                                                                                                                                           |
 | payload_json?      | string                                                                                       | JSON-encoded body of non-file params, only for `multipart/form-data` requests. See [Uploading Files](#DOCS_REFERENCE/uploading-files)                                                                                             |
 | attachments?       | array of partial [attachment](#DOCS_RESOURCES_MESSAGE/attachment-object) objects             | Attachment objects with filename and description. See [Uploading Files](#DOCS_REFERENCE/uploading-files)                                                                                                                          |
-| flags?             | integer                                                                                      | [Message flags](#DOCS_RESOURCES_MESSAGE/message-object-message-flags) combined as a [bitfield](https://en.wikipedia.org/wiki/Bit_field) (only `SUPPRESS_EMBEDS` and `SUPPRESS_NOTIFICATIONS` can be set)                          |
+| flags?             | integer                                                                                      | [Message flags](#DOCS_RESOURCES_MESSAGE/message-object-message-flags) combined as a [bitfield](https://en.wikipedia.org/wiki/Bit_field) (only `SUPPRESS_EMBEDS`, `SUPPRESS_NOTIFICATIONS`, and `IS_VOICE_MESSAGE` can be set)                          |
 | enforce_nonce?     | boolean                                                                                      | If true and nonce is present, it will be checked for uniqueness in the past few minutes. If another message was created by the same author with the same nonce, that message will be returned and no new message will be created. |
 | poll?              | [poll](#DOCS_RESOURCES_POLL/poll-create-request-object) request object                       | A poll!                                                                                                                                                                                                                           |