diff --git a/src/schema.ts b/src/schema.ts
index 0eb5d99..8c1828a 100644
--- a/src/schema.ts
+++ b/src/schema.ts
@@ -1689,6 +1689,8 @@ export interface components {
       id: string;
       /** @description Whether this reply should mention the message's author */
       mention: boolean;
+      /** @description Whether to error if the referenced message doesn't exist. Otherwise, send a message without this reply. Default is true. */
+      fail_if_not_exists?: boolean | null;
     };
     /** @description Representation of a text embed before it is sent. */
     SendableEmbed: {