diff --git a/plugin.rb b/plugin.rb
index e5a1f2f..a8b664f 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # name: discourse-signatures
 # about: A plugin to get that nostalgia signatures in Discourse Foruns
 # version: 2.0.0