diff --git a/packages/backend/src/server/api/endpoints/users/notes.ts b/packages/backend/src/server/api/endpoints/users/notes.ts
index 4613bfcf2a9f..6be391be4e44 100644
--- a/packages/backend/src/server/api/endpoints/users/notes.ts
+++ b/packages/backend/src/server/api/endpoints/users/notes.ts
@@ -18,8 +18,6 @@ import { ApiError } from '../../error.js';
 export const meta = {
 	tags: ['users', 'notes'],
 
-	description: 'Show all notes that this user created.',
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
diff --git a/packages/backend/test/e2e/timelines.ts b/packages/backend/test/e2e/timelines.ts
index 03311ac833c2..b1e84a821c38 100644
--- a/packages/backend/test/e2e/timelines.ts
+++ b/packages/backend/test/e2e/timelines.ts
@@ -7,10 +7,14 @@ process.env.NODE_ENV = 'test';
 process.env.FORCE_FOLLOW_REMOTE_USER_FOR_TESTING = 'true';
 
 import * as assert from 'assert';
-import { signup, api, post, react, startServer, waitFire, sleep, uploadUrl } from '../utils.js';
+import { signup, api, post, react, startServer, waitFire, sleep, uploadUrl, randomString } from '../utils.js';
 import type { INestApplicationContext } from '@nestjs/common';
 import type * as misskey from 'misskey-js';
 
+function genHost() {
+	return randomString() + '.example.com';
+}
+
 let app: INestApplicationContext;
 
 beforeAll(async () => {
@@ -290,7 +294,7 @@ describe('Timelines', () => {
 		});
 
 		test.concurrent('フォローしているリモートユーザーのノートが含まれる', async () => {
-			const [alice, bob] = await Promise.all([signup(), signup({ host: 'example.com' })]);
+			const [alice, bob] = await Promise.all([signup(), signup({ host: genHost() })]);
 
 			await api('/following/create', { userId: bob.id }, alice);
 			const bobNote = await post(bob, { text: 'hi' });
@@ -303,7 +307,7 @@ describe('Timelines', () => {
 		});
 
 		test.concurrent('フォローしているリモートユーザーの visibility: home なノートが含まれる', async () => {
-			const [alice, bob] = await Promise.all([signup(), signup({ host: 'example.com' })]);
+			const [alice, bob] = await Promise.all([signup(), signup({ host: genHost() })]);
 
 			await api('/following/create', { userId: bob.id }, alice);
 			const bobNote = await post(bob, { text: 'hi', visibility: 'home' });
@@ -355,7 +359,7 @@ describe('Timelines', () => {
 		});
 
 		test.concurrent('リモートユーザーのノートが含まれない', async () => {
-			const [alice, bob] = await Promise.all([signup(), signup({ host: 'example.com' })]);
+			const [alice, bob] = await Promise.all([signup(), signup({ host: genHost() })]);
 
 			const bobNote = await post(bob, { text: 'hi' });
 
@@ -487,7 +491,7 @@ describe('Timelines', () => {
 		});
 
 		test.concurrent('リモートユーザーのノートが含まれない', async () => {
-			const [alice, bob] = await Promise.all([signup(), signup({ host: 'example.com' })]);
+			const [alice, bob] = await Promise.all([signup(), signup({ host: genHost() })]);
 
 			const bobNote = await post(bob, { text: 'hi' });
 
@@ -499,7 +503,7 @@ describe('Timelines', () => {
 		});
 
 		test.concurrent('フォローしているリモートユーザーのノートが含まれる', async () => {
-			const [alice, bob] = await Promise.all([signup(), signup({ host: 'example.com' })]);
+			const [alice, bob] = await Promise.all([signup(), signup({ host: genHost() })]);
 
 			await api('/following/create', { userId: bob.id }, alice);
 			const bobNote = await post(bob, { text: 'hi' });
@@ -512,7 +516,7 @@ describe('Timelines', () => {
 		});
 
 		test.concurrent('フォローしているリモートユーザーの visibility: home なノートが含まれる', async () => {
-			const [alice, bob] = await Promise.all([signup(), signup({ host: 'example.com' })]);
+			const [alice, bob] = await Promise.all([signup(), signup({ host: genHost() })]);
 
 			await api('/following/create', { userId: bob.id }, alice);
 			const bobNote = await post(bob, { text: 'hi', visibility: 'home' });
@@ -704,7 +708,7 @@ describe('Timelines', () => {
 
 			await sleep(100); // redisに追加されるのを待つ
 
-			const res = await api('/users/notes', {}, alice);
+			const res = await api('/users/notes', { userId: bob.id }, alice);
 
 			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), false);
 		});
@@ -717,7 +721,7 @@ describe('Timelines', () => {
 
 			await sleep(100); // redisに追加されるのを待つ
 
-			const res = await api('/users/notes', {}, alice);
+			const res = await api('/users/notes', { userId: bob.id }, alice);
 
 			assert.strictEqual(res.body.some((note: any) => note.id === bobNote.id), true);
 			assert.strictEqual(res.body.find((note: any) => note.id === bobNote.id).text, 'hi');
@@ -732,7 +736,7 @@ describe('Timelines', () => {
 
 			await sleep(100); // redisに追加されるのを待つ
 
-			const res = await api('/users/notes', {}, alice);
+			const res = await api('/users/notes', { userId: bob.id }, alice);
 
 			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
 			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), false);
@@ -747,7 +751,7 @@ describe('Timelines', () => {
 
 			await sleep(100); // redisに追加されるのを待つ
 
-			const res = await api('/users/notes', { withReplies: true }, alice);
+			const res = await api('/users/notes', { userId: bob.id, withReplies: true }, alice);
 
 			assert.strictEqual(res.body.some((note: any) => note.id === bobNote1.id), true);
 			assert.strictEqual(res.body.some((note: any) => note.id === bobNote2.id), true);
diff --git a/packages/backend/test/utils.ts b/packages/backend/test/utils.ts
index fae901842289..121c4711d3bf 100644
--- a/packages/backend/test/utils.ts
+++ b/packages/backend/test/utils.ts
@@ -99,7 +99,7 @@ export const relativeFetch = async (path: string, init?: RequestInit | undefined
 	return await fetch(new URL(path, `http://127.0.0.1:${port}/`).toString(), init);
 };
 
-function randomString(chars = 'abcdefghijklmnopqrstuvwxyz0123456789', length = 16) {
+export function randomString(chars = 'abcdefghijklmnopqrstuvwxyz0123456789', length = 16) {
 	let randomString = '';
 	for (let i = 0; i < length; i++) {
 		randomString += chars[Math.floor(Math.random() * chars.length)];