diff --git a/message.go b/message.go
index a297c2f..b669e9b 100644
--- a/message.go
+++ b/message.go
@@ -238,6 +238,7 @@ type MessageSend struct {
 	AllowedMentions *MessageAllowedMentions `json:"allowed_mentions,omitempty"`
 	Reference       *MessageReference       `json:"message_reference,omitempty"`
 	StickerIDs      []string                `json:"sticker_ids"`
+	Flags           MessageFlags            `json:"flags,omitempty"`
 
 	// TODO: Remove this when compatibility is not required.
 	File *File `json:"-"`