diff --git a/README.md b/README.md
index 2780dcb..e93ddce 100644
--- a/README.md
+++ b/README.md
@@ -106,7 +106,7 @@ func main() {
 ## Submit tasks
 Tasks can be submitted by calling `ants.Submit(func())`
 ```go
-ants.Submit(func() {})
+ants.Submit(func() error {})
 ```
 
 ## Custom limited pool
diff --git a/README_ZH.md b/README_ZH.md
index d885f3d..1ba7098 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -115,7 +115,7 @@ ants.Submit(func() error {})
 // set 10000 the size of goroutine pool
 p, _ := ants.NewPool(10000)
 // submit a task
-p.Submit(func() {})
+p.Submit(func() error {})
 ```
 
 ## 动态调整协程池容量