diff --git a/README.md b/README.md
index 8d0dd36..f01025a 100644
--- a/README.md
+++ b/README.md
@@ -214,7 +214,7 @@ Error messages are generated using Golang template functions, allowing them to i
 
 ```golang
 // Custrom checker error containing the item name.
-err := NewCheckErrorWithData(
+err := checker.NewCheckErrorWithData(
 	"NOT_FRUIT",
 	map[string]interface{}{
 		"name": "abcd",