diff --git a/Homebrew/mas-tap.rb b/Homebrew/mas-tap.rb
index 59ad0bf..4195b6d 100644
--- a/Homebrew/mas-tap.rb
+++ b/Homebrew/mas-tap.rb
@@ -1,3 +1,7 @@
+# typed: strict
+# frozen_string_literal: true
+
+# mas command formula for custom tap (mas-cli/homebrew-tap).
 class Mas < Formula
   desc "Mac App Store command-line interface"
   homepage "https://github.com/mas-cli/mas"
diff --git a/Homebrew/mas.rb b/Homebrew/mas.rb
index 1bda0d5..050648f 100644
--- a/Homebrew/mas.rb
+++ b/Homebrew/mas.rb
@@ -1,3 +1,7 @@
+# typed: strict
+# frozen_string_literal: true
+
+# mas command formula for homebrew-core tap.
 class Mas < Formula
   desc "Mac App Store command-line interface"
   homepage "https://github.com/mas-cli/mas"