diff --git a/app/controllers/events_controller.rb b/app/controllers/events_controller.rb
index 98517d7f..3e7290b2 100644
--- a/app/controllers/events_controller.rb
+++ b/app/controllers/events_controller.rb
@@ -80,6 +80,9 @@ class EventsController < ApplicationController
 
     respond_to do |format|
       if @event.update event_params
+        # Send an update mail to moderators
+        EventMailer.update(@event).deliver
+
         format.html { redirect_to :root, notice: t('.ok') }
         format.json { head :no_content }
       else
diff --git a/app/mailers/event_mailer.rb b/app/mailers/event_mailer.rb
index e46c0a79..ef35bdc2 100644
--- a/app/mailers/event_mailer.rb
+++ b/app/mailers/event_mailer.rb
@@ -1,5 +1,6 @@
 class EventMailer < ActionMailer::Base
   default from: 'moderateurs@agendadulibre.org'
+  default to: 'moderateurs@agendadulibre.org'
 
   def create(event)
     @event = event
@@ -8,4 +9,11 @@ class EventMailer < ActionMailer::Base
       to: event.contact,
       subject: t('event_mailer.create.subject', subject: event.title)
   end
+
+  def update(event)
+    @event = event
+
+    mail 'In-Reply-To' => "<event-#{event.id}@#{ActionMailer::Base.default_url_options[:host]}>",
+      subject: t('event_mailer.update.subject', subject: event.title)
+  end
 end
diff --git a/app/views/event_mailer/update.text.haml b/app/views/event_mailer/update.text.haml
new file mode 100644
index 00000000..2931d630
--- /dev/null
+++ b/app/views/event_mailer/update.text.haml
@@ -0,0 +1,13 @@
+=t '.title'
+\
+=t '.body', subject: @event.title
+
+- Differ.format = :ascii
+= raw Differ.diff(@event.description, @event.description_was).to_s |
+  .gsub(/\[31m/, '') |
+  .gsub(/\[32m/, '') |
+  .gsub(/\[0m/, '') |
+\
+= edit_moderation_url @event
+\
+=t '.signature'
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index d36cf975..169161bf 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -254,6 +254,11 @@ fr:
 \n\nPendant la modération et après celle-ci si votre évènement est validé, vous pouvez éditer votre évènement à l'adresse:"
       delete_link: "et vous pouvez l'annuler en utilisant l'adresse:"
       signature: "Merci de votre participation!\n\n-- \nAgenda du Libre"
+    update:
+      subject: "[Agenda du Libre] Édition de l'évènement '%{subject}'"
+      title: Bonjour,
+      body: "L'évènement '%{subject}' a été modifié par le soumetteur de l'évènement\n\nModifications apportées:"
+      signature: "Bonne journée\n\n-- \nL'équipe de modération"
   moderation_mailer:
     create:
       subject: "[Agenda du Libre] Nouvel évènement à modérer: '%{subject}'"
diff --git a/test/controllers/events_controller_test.rb b/test/controllers/events_controller_test.rb
index d727034b..8141d124 100644
--- a/test/controllers/events_controller_test.rb
+++ b/test/controllers/events_controller_test.rb
@@ -95,7 +95,7 @@ class EventsControllerTest < ActionController::TestCase
       tags: @event.tags }
 
     assert_empty assigns(:event).errors.messages
-    assert_redirected_to event_path(assigns(:event))
+    assert_redirected_to :root
   end
 
   test 'should get cancel page' do
diff --git a/test/mailers/event_mailer_test.rb b/test/mailers/event_mailer_test.rb
index 58aefba3..8b40d00d 100644
--- a/test/mailers/event_mailer_test.rb
+++ b/test/mailers/event_mailer_test.rb
@@ -12,4 +12,11 @@ class EventMailerTest < ActionMailer::TestCase
     assert_equal ['moderateurs@agendadulibre.org'], mail.from
     assert_match(/Bonjour.*/, mail.body.encoded)
   end
+
+  test 'update' do
+    mail = EventMailer.update Event.last
+    assert_match(/\[Agenda du Libre\] Édition de l'évènement .*/, mail.subject)
+    assert_equal ['moderateurs@agendadulibre.org'], mail.to
+    assert_equal ['moderateurs@agendadulibre.org'], mail.from
+  end
 end
diff --git a/test/mailers/previews/event_mailer_preview.rb b/test/mailers/previews/event_mailer_preview.rb
index 86f10966..9178029b 100644
--- a/test/mailers/previews/event_mailer_preview.rb
+++ b/test/mailers/previews/event_mailer_preview.rb
@@ -6,4 +6,10 @@ class EventMailerPreview < ActionMailer::Preview
     ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
     EventMailer.create Event.last
   end
+
+  # Preview this email at http://localhost:3000/rails/mailers/event_mailer/update
+  def update
+    ActionMailer::Base.default_url_options[:host] = 'localhost:3000'
+    EventMailer.update Event.last
+  end
 end