7 files changed, 14 insertions, 0 deletions
diff --git a/app/services/milestones/base_service.rb b/app/services/milestones/base_service.rb
index cce0863d611..f30194c0bfe 100644
--- a/app/services/milestones/base_service.rb
+++ b/app/services/milestones/base_service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Milestones
   class BaseService < ::BaseService
     # Parent can either a group or a project
diff --git a/app/services/milestones/close_service.rb b/app/services/milestones/close_service.rb
index 5b06c4b601d..a252f5c144e 100644
--- a/app/services/milestones/close_service.rb
+++ b/app/services/milestones/close_service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Milestones
   class CloseService < Milestones::BaseService
     def execute(milestone)
diff --git a/app/services/milestones/create_service.rb b/app/services/milestones/create_service.rb
index ed2e833d833..6c3edd2e147 100644
--- a/app/services/milestones/create_service.rb
+++ b/app/services/milestones/create_service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Milestones
   class CreateService < Milestones::BaseService
     def execute
diff --git a/app/services/milestones/destroy_service.rb b/app/services/milestones/destroy_service.rb
index b18651476a8..15c04525075 100644
--- a/app/services/milestones/destroy_service.rb
+++ b/app/services/milestones/destroy_service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Milestones
   class DestroyService < Milestones::BaseService
     def execute(milestone)
diff --git a/app/services/milestones/promote_service.rb b/app/services/milestones/promote_service.rb
index 2187f26d1ed..37aa6d3a9bc 100644
--- a/app/services/milestones/promote_service.rb
+++ b/app/services/milestones/promote_service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Milestones
   class PromoteService < Milestones::BaseService
     PromoteMilestoneError = Class.new(StandardError)
diff --git a/app/services/milestones/reopen_service.rb b/app/services/milestones/reopen_service.rb
index 3efb33157c5..125a3ec1367 100644
--- a/app/services/milestones/reopen_service.rb
+++ b/app/services/milestones/reopen_service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Milestones
   class ReopenService < Milestones::BaseService
     def execute(milestone)
diff --git a/app/services/milestones/update_service.rb b/app/services/milestones/update_service.rb
index 74edbf9b41d..81b20943bab 100644
--- a/app/services/milestones/update_service.rb
+++ b/app/services/milestones/update_service.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Milestones
   class UpdateService < Milestones::BaseService
     def execute(milestone)