diff --git a/bundle.go b/bundle.go
index f403880..188f52d 100644
--- a/bundle.go
+++ b/bundle.go
@@ -13,7 +13,9 @@ import (
 	htemplate "html/template"
 )
 
-var code_template = `// autogenerated. do not edit!
+var code_template = `// +build release
+
+// autogenerated. do not edit!
 
 package server