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-rw-r--r--rubocop/cop/migration/add_index.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/rubocop/cop/migration/add_index.rb b/rubocop/cop/migration/add_index.rb
index 5e6766f6994..fa21a0d6555 100644
--- a/rubocop/cop/migration/add_index.rb
+++ b/rubocop/cop/migration/add_index.rb
@@ -7,7 +7,7 @@ module RuboCop
class AddIndex < RuboCop::Cop::Cop
include MigrationHelpers
- MSG = '`add_index` requires downtime, use `add_concurrent_index` instead'
+ MSG = '`add_index` requires downtime, use `add_concurrent_index` instead'.freeze
def on_def(node)
return unless in_migration?(node)