diff --git a/docs/helpers/websocket.md b/docs/helpers/websocket.md
index ec4bc23a..ca084513 100644
--- a/docs/helpers/websocket.md
+++ b/docs/helpers/websocket.md
@@ -20,8 +20,10 @@ import { upgradeWebSocket } from 'hono/deno'
 ```ts [Bun]
 import { Hono } from 'hono'
 import { createBunWebSocket } from 'hono/bun'
+import type { ServerWebSocket } from 'bun'
 
-const { upgradeWebSocket, websocket } = createBunWebSocket()
+const { upgradeWebSocket, websocket } =
+  createBunWebSocket<ServerWebSocket>()
 
 // ...