diff --git a/config/routes.rb b/config/routes.rb
index 3d64fe247..6359ad589 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -2,6 +2,8 @@ Rails.application.routes.draw do
   mount Ckeditor::Engine => "/ckeditor"
   mount LetterOpenerWeb::Engine, at: "/letter_opener" if Rails.env.development?
 
+  draw :custom
+
   draw :account
   draw :admin
   draw :budget
diff --git a/config/routes/custom.rb b/config/routes/custom.rb
new file mode 100644
index 000000000..8c5264b50
--- /dev/null
+++ b/config/routes/custom.rb
@@ -0,0 +1,28 @@
+# Add your custom routes here.
+#
+# For example, if you'd like to add a new section in the admin area
+# to manage happy thoughts and verify they've become true, you can
+# write:
+#
+# namespace :admin do
+#   resources :happy_thoughts do
+#     member do
+#       put :verify
+#     end
+#   end
+# end
+#
+# Or, if, for example, you'd like to add a form to edit debates in the
+# admin area:
+#
+# namespace :admin do
+#   resources :debates, only: [:edit, :update]
+# end
+#
+# Doing so, the existing debates routes in the admin area will be kept,
+# and the routes to edit and update them will be added.
+#
+# Note that the routes you define on this file will take precedence
+# over the default routes. So, if you define a route for `/proposals`,
+# the default action for `/proposals` will not be used and the one you
+# define will be used instead.
diff --git a/docs/en/SUMMARY.md b/docs/en/SUMMARY.md
index d1ac2ea7f..5401ff654 100644
--- a/docs/en/SUMMARY.md
+++ b/docs/en/SUMMARY.md
@@ -40,6 +40,7 @@
   * [Other Ruby classes (GraphQL, lib, mailers, builders)](customization/ruby.md)
   * [Gems](customization/gems.md)
   * [Application configuration](customization/application.md)
+  * [Routes](customization/routes.md)
   * [Tests](customization/tests.md)
 
 * [Technical Features](features/features.md)
diff --git a/docs/en/customization/customization.md b/docs/en/customization/customization.md
index 208ea0284..1921e7bdb 100644
--- a/docs/en/customization/customization.md
+++ b/docs/en/customization/customization.md
@@ -12,4 +12,5 @@
 * [Other Ruby classes (GraphQL, lib, mailers, builders)](ruby.md)
 * [Gems](gems.md)
 * [Application configuration](application.md)
+* [Routes](routes.md)
 * [Tests](tests.md)
diff --git a/docs/en/customization/introduction.md b/docs/en/customization/introduction.md
index 4d04132d8..4073f91a8 100644
--- a/docs/en/customization/introduction.md
+++ b/docs/en/customization/introduction.md
@@ -41,6 +41,7 @@ There are also files where you can apply some customizations:
 * `config/environments/custom/production.rb`
 * `config/environments/custom/staging.rb`
 * `config/environments/custom/test.rb`
+* `config/routes/custom.rb`
 * `Gemfile_custom`
 
 Using these files, you will be able to customize [translations](translations.md), [images](images.md), [CSS](css.md), [JavaScript](javascript.md), [HTML views](views.md), any Ruby code like [models](models.md), [controllers](controllers.md), [components](components.md) or [other Ruby classes](ruby.md), [gems](gems.md), [application configuration](application.md), [routes](routes.md) and [tests](tests.md).
diff --git a/docs/en/customization/routes.md b/docs/en/customization/routes.md
new file mode 100644
index 000000000..bbd4a3e38
--- /dev/null
+++ b/docs/en/customization/routes.md
@@ -0,0 +1,27 @@
+# Customizing routes
+
+When adding custom controller actions, you also need to define a route to configure the URL that will be used for those actions. You can do so by editing the `config/routes/custom.rb` file.
+
+For example, if you'd like to add a new section in the admin area to manage happy thoughts and verify they've become true, you can write:
+
+```ruby
+namespace :admin do
+  resources :happy_thoughts do
+    member do
+      put :verify
+    end
+  end
+end
+```
+
+Or, if, for example, you'd like to add a form to edit debates in the admin area:
+
+```ruby
+namespace :admin do
+  resources :debates, only: [:edit, :update]
+end
+```
+
+Doing so, the existing debates routes in the admin area will be kept, and the routes to edit and update them will be added.
+
+Note that the routes you define on this file will take precedence over the default routes. So, if you define a route for `/proposals`, the default action for `/proposals` will not be used and the one you define will be used instead.
diff --git a/docs/es/SUMMARY.md b/docs/es/SUMMARY.md
index f45c50de1..2010561df 100644
--- a/docs/es/SUMMARY.md
+++ b/docs/es/SUMMARY.md
@@ -40,6 +40,7 @@
   * [Otras clases de Ruby (GraphQL, lib, mailers, builders)](customization/ruby.md)
   * [Gemas](customization/gems.md)
   * [Configuración de la aplicación](customization/application.md)
+  * [Rutas](customization/routes.md)
   * [Tests](customization/tests.md)
 
 * [Funcionalidades Técnicas](features/features.md)
diff --git a/docs/es/customization/customization.md b/docs/es/customization/customization.md
index 70372ab9b..785cfff1e 100644
--- a/docs/es/customization/customization.md
+++ b/docs/es/customization/customization.md
@@ -12,4 +12,5 @@
 * [Otras clases de Ruby (GraphQL, lib, mailers, builders)](ruby.md)
 * [Gemas](gems.md)
 * [Configuración de la aplicación](application.md)
+* [Rutas](routes.md)
 * [Tests](tests.md)
diff --git a/docs/es/customization/introduction.md b/docs/es/customization/introduction.md
index 2057946c9..f5e4292ae 100644
--- a/docs/es/customization/introduction.md
+++ b/docs/es/customization/introduction.md
@@ -41,6 +41,7 @@ Aparte de estos directorios, también puedes utilizar los siguientes ficheros:
 * `config/environments/custom/production.rb`
 * `config/environments/custom/staging.rb`
 * `config/environments/custom/test.rb`
+* `config/routes/custom.rb`
 * `Gemfile_custom`
 
 Utilizando estos ficheros, podrás personalizar [traducciones](translations.md), [imágenes](images.md), [CSS](css.md), [JavaScript](javascript.md), [vistas HTML](views.md), cualquier código de Ruby como [modelos](models.md), [controladores](controllers.md), [componentes](components.md) u [otras clases de Ruby](ruby.md), [gemas](gems.md), [configuración de la aplicación](application.md), [rutas](routes.md) y [tests](tests.md).
diff --git a/docs/es/customization/routes.md b/docs/es/customization/routes.md
new file mode 100644
index 000000000..73fbc0976
--- /dev/null
+++ b/docs/es/customization/routes.md
@@ -0,0 +1,27 @@
+# Personalización de rutas
+
+Al añadir acciones de controlador personalizadas, necesitas definir una ruta que configure la URL que se usará para esas acciones. Puedes hacerlo editando el fichero `config/routes/custom.rb`.
+
+Por ejemplo, para añadir una nueva sección al área de administración para gestionar pensamientos felices ("happy thoughts", en inglés) y verificar que se han hecho realidad, puedes escribir el siguiente código:
+
+```ruby
+namespace :admin do
+  resources :happy_thoughts do
+    member do
+      put :verify
+    end
+  end
+end
+```
+
+O, si, por ejemplo, quisieras añadir un formulario para editar debates en el área de administración:
+
+```ruby
+namespace :admin do
+  resources :debates, only: [:edit, :update]
+end
+```
+
+Al hacer esto, las rutas existentes de debates en el área de administración se mantendrán, y a ellas se añadirán las rutas "edit" y "update".
+
+Las rutas que defines en este fichero tendrán precedencia sobre las rutas por defecto. Así que, si defines una ruta para `/proposals`, la acción por defecto para `/proposals` no se utilizará sino que en su lugar se usará la que definas tú.