diff --git a/docs/dev-guide/ui-api.md b/docs/dev-guide/ui-api.md
index a742100d9e..1b78128bf0 100644
--- a/docs/dev-guide/ui-api.md
+++ b/docs/dev-guide/ui-api.md
@@ -146,7 +146,7 @@ See [Prompts](#prompts) for more info.
 
 The `data` object contains the JSON result of each config file content.
 
-For example, let's say the user has the following `vue.config.js` in his project:
+For example, let's say the user has the following `vue.config.js` in their project:
 
 ```js
 module.exports = {