diff --git a/packages/backend/src/server/api/mastodon/converters/note.ts b/packages/backend/src/server/api/mastodon/converters/note.ts
index a592529cf..ac6244a69 100644
--- a/packages/backend/src/server/api/mastodon/converters/note.ts
+++ b/packages/backend/src/server/api/mastodon/converters/note.ts
@@ -128,6 +128,7 @@ export class NoteConverter {
             reactions: [], //FIXME: this.mapReactions(n.emojis, n.reactions, n.myReaction),
             bookmarked: isBookmarked,
             quote: Promise.resolve(renote).then(renote => renote && note.text !== null ? this.encode(renote, user, cache) : null),
+						edited_at: note.updatedAt?.toISOString()
         });
     }
 
diff --git a/packages/backend/src/server/api/mastodon/entities/status.ts b/packages/backend/src/server/api/mastodon/entities/status.ts
index 720d32c8b..b6112c64c 100644
--- a/packages/backend/src/server/api/mastodon/entities/status.ts
+++ b/packages/backend/src/server/api/mastodon/entities/status.ts
@@ -41,6 +41,7 @@ namespace MastodonEntity {
 		reactions: Array<Reaction>;
 		quote: Status | null;
 		bookmarked: boolean;
+		edited_at: string | null;
 	};
 
 	export type StatusCreationRequest = {