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-rw-r--r--lib/rouge/plugins/common_mark.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/rouge/plugins/common_mark.rb b/lib/rouge/plugins/common_mark.rb
index 8f9de061124..d240df5a0e0 100644
--- a/lib/rouge/plugins/common_mark.rb
+++ b/lib/rouge/plugins/common_mark.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
# A rouge plugin for CommonMark markdown engine.
# Used to highlight code generated by CommonMark.