diff --git a/README.md b/README.md
index 63a00b9..5cad0fc 100644
--- a/README.md
+++ b/README.md
@@ -3,9 +3,11 @@
 ## Run
 
 1. Setup the environment variables in `.env`
-2. `docker compose up -d`
+2. Modify `config.ts` if you want.
+3. `docker compose up -d`
 
-## Usage
+## Functionality
 
+- Apply default role to new members while joining.
 - `/ping` repond with latency.
-- `/applyrole` apply role to everyone in the guild. (max 1000 people)
+- `/applyrole` apply role to everyone in the guild.
diff --git a/config.ts b/config.ts
index f6ed69d..6cc2ae5 100644
--- a/config.ts
+++ b/config.ts
@@ -3,20 +3,20 @@ import dotenv from 'dotenv';
 dotenv.config();
 
 export const config = {
+	// Token and client id can be found in Discord Developer Protol.
   token: process.env.DC_TOKEN!,
   clientId: process.env.DC_CLIENTID!,
+	
+	// The user that the bot will DM when starts.
   adminId: process.env.ADMIN_ID ?? '',
-  nickname: '橘ありす',
+  
+	nickname: '橘ありす',
 	playing: 'アイドルマスター シンデレラガールズ U149',
-	defaultRole: process.env.DEFAULT_ROLE ?? '',
-  urls: {
-    author: 'https://konchin.com',
-    icon: 'https://secure.gravatar.com/avatar/c35f2cb664f366e3e3365b9c22216834?d=identicon&s=512',
-    help: '',
-    git: 'https://git.konchin.com/discord-bot/Tanikaze-Amane',
-    issue: 'https://git.konchin.com/discord-bot/Tanikaze-Amane/issues'
-  },
   logger: {
     logFile: 'test.log',
   },
+	
+	// The default role id to apply when new member join.
+	// Can be obtained in Discord from right clicking the role.
+	defaultRole: process.env.DEFAULT_ROLE ?? '',
 };