diff --git a/internal/util/funcutil/slice.go b/internal/util/funcutil/slice.go
index c9288f0a43..467487ffc9 100644
--- a/internal/util/funcutil/slice.go
+++ b/internal/util/funcutil/slice.go
@@ -13,6 +13,7 @@ package funcutil
 
 import "reflect"
 
+// SliceContain returns true if slice s contains item.
 func SliceContain(s interface{}, item interface{}) bool {
 	ss := reflect.ValueOf(s)
 	if ss.Kind() != reflect.Slice {