diff --git a/packages/backend/src/core/AnnouncementService.ts b/packages/backend/src/core/AnnouncementService.ts
index c2eb3d596f..f8e1433d8f 100644
--- a/packages/backend/src/core/AnnouncementService.ts
+++ b/packages/backend/src/core/AnnouncementService.ts
@@ -57,6 +57,33 @@ export class AnnouncementService {
 		return q.getMany();
 	}
 
+	@bindThis
+	public async create(values: Partial<Announcement>): Promise<{ raw: Announcement; packed: Packed<'Announcement'> }> {
+		const announcement = await this.announcementsRepository.insert({
+			id: this.idService.genId(),
+			createdAt: new Date(),
+			updatedAt: null,
+			title: values.title,
+			text: values.text,
+			imageUrl: values.imageUrl,
+			display: values.display,
+			forExistingUsers: values.forExistingUsers,
+			needConfirmationToRead: values.needConfirmationToRead,
+			userId: values.userId,
+		}).then(x => this.announcementsRepository.findOneByOrFail(x.identifiers[0]));
+
+		const packed = (await this.packMany([announcement]))[0];
+
+		this.globalEventService.publishBroadcastStream('announcementCreated', {
+			announcement: packed,
+		});
+
+		return {
+			raw: announcement,
+			packed: packed,
+		};
+	}
+
 	@bindThis
 	public async read(user: User, announcementId: Announcement['id']): Promise<void> {
 		try {
@@ -87,12 +114,13 @@ export class AnnouncementService {
 		return announcements.map(announcement => ({
 			id: announcement.id,
 			createdAt: announcement.createdAt.toISOString(),
-			updatedAt: announcement.updatedAt?.toISOString(),
+			updatedAt: announcement.updatedAt?.toISOString() ?? null,
 			text: announcement.text,
 			title: announcement.title,
 			imageUrl: announcement.imageUrl,
 			display: announcement.display,
 			needConfirmationToRead: announcement.needConfirmationToRead,
+			forYou: announcement.userId === me?.id,
 			isRead: reads.some(read => read.announcementId === announcement.id),
 		}));
 	}
diff --git a/packages/backend/src/misc/json-schema.ts b/packages/backend/src/misc/json-schema.ts
index 90d5faeac0..80c1041c62 100644
--- a/packages/backend/src/misc/json-schema.ts
+++ b/packages/backend/src/misc/json-schema.ts
@@ -35,6 +35,7 @@ import { packedQueueCountSchema } from '@/models/json-schema/queue.js';
 import { packedGalleryPostSchema } from '@/models/json-schema/gallery-post.js';
 import { packedEmojiDetailedSchema, packedEmojiSimpleSchema } from '@/models/json-schema/emoji.js';
 import { packedFlashSchema } from '@/models/json-schema/flash.js';
+import { packedAnnouncementSchema } from '@/models/json-schema/announcement.js';
 
 export const refs = {
 	UserLite: packedUserLiteSchema,
diff --git a/packages/backend/src/models/json-schema/announcement.ts b/packages/backend/src/models/json-schema/announcement.ts
index 625bc057a0..12dec96f3c 100644
--- a/packages/backend/src/models/json-schema/announcement.ts
+++ b/packages/backend/src/models/json-schema/announcement.ts
@@ -38,13 +38,17 @@ export const packedAnnouncementSchema = {
 			type: 'string',
 			optional: false, nullable: false,
 		},
-		isRead: {
+		forYou: {
 			type: 'boolean',
-			optional: true, nullable: false,
+			optional: false, nullable: false,
 		},
 		needConfirmationToRead: {
 			type: 'boolean',
 			optional: false, nullable: false,
 		},
+		isRead: {
+			type: 'boolean',
+			optional: true, nullable: false,
+		},
 	},
 } as const;
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/create.ts b/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
index 63d68c2e96..454379cbe6 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
@@ -3,11 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Inject, Injectable } from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
-import type { AnnouncementsRepository } from '@/models/index.js';
-import { IdService } from '@/core/IdService.js';
-import { DI } from '@/di-symbols.js';
+import { AnnouncementService } from '@/core/AnnouncementService.js';
 
 export const meta = {
 	tags: ['admin'],
@@ -69,14 +67,10 @@ export const paramDef = {
 @Injectable()
 export default class extends Endpoint<typeof meta, typeof paramDef> {
 	constructor(
-		@Inject(DI.announcementsRepository)
-		private announcementsRepository: AnnouncementsRepository,
-
-		private idService: IdService,
+		private announcementService: AnnouncementService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const announcement = await this.announcementsRepository.insert({
-				id: this.idService.genId(),
+			const { raw, packed } = await this.announcementService.create({
 				createdAt: new Date(),
 				updatedAt: null,
 				title: ps.title,
@@ -86,9 +80,9 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				forExistingUsers: ps.forExistingUsers,
 				needConfirmationToRead: ps.needConfirmationToRead,
 				userId: ps.userId,
-			}).then(x => this.announcementsRepository.findOneByOrFail(x.identifiers[0]));
+			});
 
-			return Object.assign({}, announcement, { createdAt: announcement.createdAt.toISOString(), updatedAt: null });
+			return packed;
 		});
 	}
 }
diff --git a/packages/backend/src/server/api/stream/types.ts b/packages/backend/src/server/api/stream/types.ts
index 82ccd91c88..1f0dea03b1 100644
--- a/packages/backend/src/server/api/stream/types.ts
+++ b/packages/backend/src/server/api/stream/types.ts
@@ -64,6 +64,9 @@ export interface BroadcastTypes {
 			[other: string]: any;
 		}[];
 	};
+	announcementCreated: {
+		announcement: Packed<'Announcement'>;
+	};
 }
 
 export interface MainStreamTypes {