diff --git a/packages/backend/.idea/.gitignore b/packages/backend/.idea/.gitignore
new file mode 100644
index 0000000000..13566b81b0
--- /dev/null
+++ b/packages/backend/.idea/.gitignore
@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/packages/backend/src/queue/processors/inbox.ts b/packages/backend/src/queue/processors/inbox.ts
index 420d74bb0b..33949672cd 100644
--- a/packages/backend/src/queue/processors/inbox.ts
+++ b/packages/backend/src/queue/processors/inbox.ts
@@ -20,7 +20,7 @@ import { UserPublickey } from '@/models/entities/user-publickey.js';
 
 const logger = new Logger('inbox');
 
-// ユーザーのinboxにアクティビティが届いた時の処理
+// Processing when an activity arrives in the user's inbox
 export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 	const signature = job.data.signature;	// HTTP-signature
 	const activity = job.data.activity;
@@ -30,16 +30,15 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 	delete info['@context'];
 	logger.debug(JSON.stringify(info, null, 2));
 	//#endregion
-
 	const host = toPuny(new URL(signature.keyId).hostname);
 
-	// ブロックしてたら中断
+	// interrupt if blocked
 	const meta = await fetchMeta();
 	if (meta.blockedHosts.includes(host)) {
 		return `Blocked request: ${host}`;
 	}
 
-	// 非公開モードなら許可なインスタンスのみ
+	// only whitelisted instances in private mode
 	if (meta.privateMode && !meta.allowedHosts.includes(host)) {
 		return `Blocked request: ${host}`;
 	}
@@ -51,7 +50,7 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 
 	const dbResolver = new DbResolver();
 
-	// HTTP-Signature keyIdを元にDBから取得
+	// HTTP-Signature keyId from DB
 	let authUser: {
 		user: CacheableRemoteUser;
 		key: UserPublickey | null;
@@ -62,7 +61,7 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 		try {
 			authUser = await dbResolver.getAuthUserFromApId(getApId(activity.actor));
 		} catch (e) {
-			// 対象が4xxならスキップ
+			// Skip if target is 4xx
 			if (e instanceof StatusError) {
 				if (e.isClientError) {
 					return `skip: Ignored deleted actors on both ends ${activity.actor} - ${e.statusCode}`;
diff --git a/packages/backend/src/remote/activitypub/type.ts b/packages/backend/src/remote/activitypub/type.ts
index 2c4935a879..d04352e4cc 100644
--- a/packages/backend/src/remote/activitypub/type.ts
+++ b/packages/backend/src/remote/activitypub/type.ts
@@ -157,6 +157,7 @@ export interface IActor extends IObject {
 	preferredUsername?: string;
 	manuallyApprovesFollowers?: boolean;
 	movedTo?: string;
+	alsoKnownAs?: string[];
 	discoverable?: boolean;
 	inbox: string;
 	sharedInbox?: string;	// 後方互換性のため
@@ -280,6 +281,10 @@ export interface IFlag extends IActivity {
 	type: 'Flag';
 }
 
+export interface IMove extends IActivity {
+	type: 'Move';
+}
+
 export const isCreate = (object: IObject): object is ICreate => getApType(object) === 'Create';
 export const isDelete = (object: IObject): object is IDelete => getApType(object) === 'Delete';
 export const isUpdate = (object: IObject): object is IUpdate => getApType(object) === 'Update';
diff --git a/packages/backend/src/server/activitypub.ts b/packages/backend/src/server/activitypub.ts
index 250a39bf04..7829157562 100644
--- a/packages/backend/src/server/activitypub.ts
+++ b/packages/backend/src/server/activitypub.ts
@@ -38,6 +38,7 @@ function inbox(ctx: Router.RouterContext) {
 		return;
 	}
 
+	// @ts-ignore
 	processInbox(ctx.request.body, signature);
 
 	ctx.status = 202;
@@ -86,7 +87,7 @@ router.get('/notes/:note', async (ctx, next) => {
 		return;
 	}
 
-	// リモートだったらリダイレクト
+	// redirect if remote
 	if (note.userHost != null) {
 		if (note.uri == null || isSelfHost(note.userHost)) {
 			ctx.status = 500;