diff --git a/src/nestjs/params/MessageIdApiParam.ts b/src/nestjs/params/MessageIdApiParam.ts
index 06e7d740..296f76cc 100644
--- a/src/nestjs/params/MessageIdApiParam.ts
+++ b/src/nestjs/params/MessageIdApiParam.ts
@@ -4,6 +4,7 @@ export const MessageIdApiParam = ApiParam({
   name: 'messageId',
   required: true,
   type: 'string',
-  description: 'Message ID',
+  description:
+    'Message ID in format <code>{fromMe}_{chat}_{message_id}[_{participant}]</code>',
   example: 'true_123456789@c.us_BAE6A33293978B16',
 });