diff --git a/services/discord-voice-bot/README.md b/services/discord-voice-bot/README.md
index 5fb3a4cc..5e93c3b0 100644
--- a/services/discord-voice-bot/README.md
+++ b/services/discord-voice-bot/README.md
@@ -1,3 +1,32 @@
+# `discord-voice-bot`
+
+Allow アイリ to talk to you and many other users in Discord voice channels.
+
+## Usage
+
+```
+pnpm i
+cp .env .env.local
+```
+
+Fill-in the following credentials as configurations:
+
+```shell
+DISCORD_TOKEN=''
+DISCORD_BOT_CLIENT_ID=''
+
+OPENAI_MODEL=''
+OPENAI_API_KEY=''
+OPENAI_API_BASE_URL=''
+
+ELEVENLABS_API_KEY=''
+ELEVENLABS_API_BASE_URL=''
+```
+
+```shell
+pnpm run -F @proj-airi/discord-voice-bot start
+```
+
 ## Acknowledgements
 
 - Implementation of Audio handling and processing https://github.com/TheTrueSCP/CharacterAIVoice/blob/54d6a41b4e0eba9ad996c5f9ddcc6230277af2f8/src/VoiceHandler.js
diff --git a/services/discord-voice-bot/src/utils/fs.ts b/services/discord-voice-bot/src/utils/fs.ts
deleted file mode 100644
index 808bf619..00000000
--- a/services/discord-voice-bot/src/utils/fs.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-import { stat } from 'node:fs/promises'
-
-export async function exists(path: string) {
-  try {
-    await stat(path)
-    return true
-  }
-  catch (error) {
-    if (isENOENTError(error))
-      return false
-
-    throw error
-  }
-}
-
-export function isENOENTError(error: unknown): boolean {
-  if (!(error instanceof Error))
-    return false
-  if (!('code' in error))
-    return false
-  if (error.code !== 'ENOENT')
-    return false
-
-  return true
-}