diff --git a/pkg/types/helper.go b/pkg/types/helper.go
index 7e4f4bb72cb7b..607f9b862272c 100644
--- a/pkg/types/helper.go
+++ b/pkg/types/helper.go
@@ -56,7 +56,7 @@ func Truncate(f float64, dec int) float64 {
 	shift := math.Pow10(dec)
 	tmp := f * shift
 
-	// When dec is smaller than -323 or larger than 308, the shift will be inf.
+	// When dec is larger than 308, the shift will be inf.
 	// At the same time, if f is 0, tmp will be NaN.
 	if math.IsInf(tmp, 0) || math.IsNaN(tmp) {
 		return f