diff --git a/preferences/migrations/0025_generaloption_general_message.py b/preferences/migrations/0025_generaloption_general_message.py
new file mode 100644
index 00000000..073ec44f
--- /dev/null
+++ b/preferences/migrations/0025_generaloption_general_message.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-12-16 02:38
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('preferences', '0024_optionaluser_all_can_create'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='generaloption',
+            name='general_message',
+            field=models.TextField(default='', help_text='Message général affiché sur le site (maintenance, etc'),
+        ),
+    ]
diff --git a/preferences/migrations/0026_auto_20171216_0401.py b/preferences/migrations/0026_auto_20171216_0401.py
new file mode 100644
index 00000000..4adba4cd
--- /dev/null
+++ b/preferences/migrations/0026_auto_20171216_0401.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-12-16 03:01
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('preferences', '0025_generaloption_general_message'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='generaloption',
+            name='general_message',
+            field=models.TextField(blank=True, default='', help_text='Message général affiché sur le site (maintenance, etc'),
+        ),
+    ]
diff --git a/preferences/models.py b/preferences/models.py
index 6a793a24..2e803b66 100644
--- a/preferences/models.py
+++ b/preferences/models.py
@@ -102,6 +102,11 @@ class GeneralOption(models.Model):
     temps où les liens sont valides"""
     PRETTY_NAME = "Options générales"
 
+    general_message = models.TextField(
+        default="",
+        blank=True,
+        help_text="Message général affiché sur le site (maintenance, etc"
+    )
     search_display_page = models.IntegerField(default=15)
     pagination_number = models.IntegerField(default=25)
     pagination_large_number = models.IntegerField(default=8)
diff --git a/preferences/templates/preferences/display_preferences.html b/preferences/templates/preferences/display_preferences.html
index 4858e414..ad807155 100644
--- a/preferences/templates/preferences/display_preferences.html
+++ b/preferences/templates/preferences/display_preferences.html
@@ -131,6 +131,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
             <th>Temps avant expiration du lien de reinitialisation de mot de passe (en heures)</th>
             <td>{{ generaloptions.req_expire_hrs }}</td>
         </tr>
+	<tr>
+            <th>Message global affiché sur le site</th>
+            <td>{{ generaloptions.general_message }}</td>
+	<tr>
     </table>
     <h4>Données de l'association</h4>
     {% if is_bureau %}
diff --git a/re2o/context_processors.py b/re2o/context_processors.py
index e562a347..0f9ea3fc 100644
--- a/re2o/context_processors.py
+++ b/re2o/context_processors.py
@@ -23,6 +23,7 @@
 
 
 from __future__ import unicode_literals
+from django.contrib import messages
 
 from preferences.models import GeneralOption, OptionalMachine
 
@@ -33,6 +34,9 @@ def context_user(request):
     general_options, _created = GeneralOption.objects.get_or_create()
     machine_options, _created = OptionalMachine.objects.get_or_create()
     user = request.user
+    global_message = general_options.general_message
+    if global_message:
+        messages.warning(request, global_message)
     if user.is_authenticated():
         interfaces = user.user_interfaces()
         is_cableur = user.is_cableur