diff --git a/src/runtime/fastlog2table.go b/src/runtime/fastlog2table.go
index c36d5835f6..6ba4a7d3f2 100644
--- a/src/runtime/fastlog2table.go
+++ b/src/runtime/fastlog2table.go
@@ -1,4 +1,4 @@
-// AUTO-GENERATED by mkfastlog2table.go
+// Code generated by mkfastlog2table.go; DO NOT EDIT.
 // Run go generate from src/runtime to update.
 // See mkfastlog2table.go for comments.
 
diff --git a/src/runtime/mkfastlog2table.go b/src/runtime/mkfastlog2table.go
index 587ebf476d..305c84a7c1 100644
--- a/src/runtime/mkfastlog2table.go
+++ b/src/runtime/mkfastlog2table.go
@@ -20,7 +20,7 @@ import (
 func main() {
 	var buf bytes.Buffer
 
-	fmt.Fprintln(&buf, "// AUTO-GENERATED by mkfastlog2table.go")
+	fmt.Fprintln(&buf, "// Code generated by mkfastlog2table.go; DO NOT EDIT.")
 	fmt.Fprintln(&buf, "// Run go generate from src/runtime to update.")
 	fmt.Fprintln(&buf, "// See mkfastlog2table.go for comments.")
 	fmt.Fprintln(&buf)