Update typescript.md (#11717)

just add file name to avoid wrong file name like `_app.ts`
vercel · Apr 7, 2020 · 44a04ac · 44a04ac
1 parent 43b9f8f
commit 44a04ac
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/basic-features/typescript.md b/docs/basic-features/typescript.md
@@ -97,7 +97,7 @@ export default (req: NextApiRequest, res: NextApiResponse<Data>) => {
 
 ## Custom `App`
 
-If you have a [custom `App` ](/docs/advanced-features/custom-app), you can use the built-in type `AppProps`, like so:
+If you have a [custom `App` ](/docs/advanced-features/custom-app), you can use the built-in type `AppProps` and change file name to `./pages/_app.tsx` like so:
 
 ```ts
 import { AppProps } from 'next/app'