diff --git a/lib/oauth.js b/lib/oauth.js
index e30c2b8..1d8bd0b 100644
--- a/lib/oauth.js
+++ b/lib/oauth.js
@@ -263,7 +263,7 @@ OAuth.prototype._getUser = function (options, accessToken, callback) {
  * openId
  * // 或
  * {
- *  "openId": "the open Id", // 必须
+ *  "openid": "the open Id", // 必须
  *  "lang": "the lang code" // zh_CN 简体，zh_TW 繁体，en 英语
  * }
  * ```