diff --git a/src/strconv/itoa.go b/src/strconv/itoa.go
index e6f6303356b..f50d8779408 100644
--- a/src/strconv/itoa.go
+++ b/src/strconv/itoa.go
@@ -20,7 +20,7 @@ func FormatInt(i int64, base int) string {
 	return s
 }
 
-// Itoa is shorthand for FormatInt(i, 10).
+// Itoa is shorthand for FormatInt(int64(i), 10).
 func Itoa(i int) string {
 	return FormatInt(int64(i), 10)
 }