1 files changed, 2 insertions, 0 deletions
diff --git a/Rakefile b/Rakefile
index dd31d33d..ccba7692 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require File.expand_path(File.dirname(__FILE__) + '/lib/axlsx/version.rb')
 
 task :build => :gendoc do