diff --git a/docs/promise.md b/docs/promise.md
index 3659ba6..053be71 100644
--- a/docs/promise.md
+++ b/docs/promise.md
@@ -45,7 +45,7 @@ Promise实例生成以后，可以用then方法分别指定Resolved状态和Reje
 ```javascript
 promise.then(function(value) {
   // success
-}, function(value) {
+}, function(error) {
   // failure
 });
 ```