diff --git a/src/internal/bytealg/index_arm64.go b/src/internal/bytealg/index_arm64.go
index 251e63567e3..e87c109519e 100644
--- a/src/internal/bytealg/index_arm64.go
+++ b/src/internal/bytealg/index_arm64.go
@@ -4,7 +4,7 @@
 
 package bytealg
 
-// Empirical data shows that using IndexShortStr can get better
+// Empirical data shows that using Index can get better
 // performance when len(s) <= 16.
 const MaxBruteForce = 16
 
@@ -14,7 +14,7 @@ func init() {
 }
 
 // Cutover reports the number of failures of IndexByte we should tolerate
-// before switching over to IndexShortStr.
+// before switching over to Index.
 // n is the number of bytes processed so far.
 // See the bytes.Index implementation for details.
 func Cutover(n int) int {