diff --git a/kb/gen.go b/kb/gen.go
index 7a6679b..45f62cc 100644
--- a/kb/gen.go
+++ b/kb/gen.go
@@ -51,6 +51,8 @@ const (
 const (
 	hdr = `package %s
 
+// AUTOGENERATED. DO NOT EDIT.
+
 // DOM keys.
 const (
 	%s)
diff --git a/kb/keys.go b/kb/keys.go
index 96645c0..c9b2dec 100644
--- a/kb/keys.go
+++ b/kb/keys.go
@@ -1,5 +1,7 @@
 package kb
 
+// AUTOGENERATED. DO NOT EDIT.
+
 // DOM keys.
 const (
 	Backspace            = "\b"