diff --git a/gems/houdini_full_contact/lib/houdini.rb b/gems/houdini_full_contact/lib/houdini.rb
index f18966b1..cb84bf3d 100644
--- a/gems/houdini_full_contact/lib/houdini.rb
+++ b/gems/houdini_full_contact/lib/houdini.rb
@@ -1,3 +1,6 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
 require "houdini/full_contact"
 
 module Houdini