diff --git a/app/controllers/api/abuses_controller.rb b/app/controllers/api/abuses_controller.rb
index 7e6639eeb..4a7397b19 100644
--- a/app/controllers/api/abuses_controller.rb
+++ b/app/controllers/api/abuses_controller.rb
@@ -1,3 +1,7 @@
+# frozen_string_literal: true
+
+# API Controller for resources of type Abuse.
+# Typical action is an user reporting an abuse on a project
 class API::AbusesController < API::ApiController
   before_action :authenticate_user!, except: :create
 
diff --git a/app/controllers/api/admins_controller.rb b/app/controllers/api/admins_controller.rb
index 2caad5661..50f1c0492 100644
--- a/app/controllers/api/admins_controller.rb
+++ b/app/controllers/api/admins_controller.rb
@@ -1,3 +1,6 @@
+# frozen_string_literal: true
+
+# API Controller for resources of type User with role 'admin'.
 class API::AdminsController < API::ApiController
   before_action :authenticate_user!
 
diff --git a/app/controllers/api/age_ranges_controller.rb b/app/controllers/api/age_ranges_controller.rb
index 03c3a5602..f8805e3f1 100644
--- a/app/controllers/api/age_ranges_controller.rb
+++ b/app/controllers/api/age_ranges_controller.rb
@@ -1,13 +1,16 @@
+# frozen_string_literal: true
+
+# API Controller for resources of type AgeRange
+# AgeRange are used in Events
 class API::AgeRangesController < API::ApiController
   before_action :authenticate_user!, except: [:index]
-  before_action :set_age_range, only: [:show, :update, :destroy]
+  before_action :set_age_range, only: %i[show update destroy]
 
   def index
     @age_ranges = AgeRange.all
   end
 
-  def show
-  end
+  def show; end
 
   def create
     authorize AgeRange