diff --git a/internal/util/funcutil/random.go b/internal/util/funcutil/random.go
index 78a89e4edd..a3ca816e32 100644
--- a/internal/util/funcutil/random.go
+++ b/internal/util/funcutil/random.go
@@ -33,6 +33,7 @@ func RandomString(n int) string {
 	return string(b)
 }
 
+// GenRandomStr generates a random string.
 func GenRandomStr() string {
 	l := rand.Uint64()%10 + 1
 	b := make([]byte, l)