diff --git a/generate.go b/generate.go
index bd3c901..1188edf 100644
--- a/generate.go
+++ b/generate.go
@@ -30,7 +30,7 @@ type Generator struct {
 	quality      int      // compression level (1-11)
 }
 
-const template = `// Code generated by broccoli at %v.
+const template = `// Code generated by broccoli at %v. DO NOT EDIT.
 package %s
 
 import "aletheia.icu/broccoli/fs"