diff --git a/app/assets/javascripts/controllers/admin/calendar.js.erb b/app/assets/javascripts/controllers/admin/calendar.js.erb
index 12e5cef95..f4c1f647e 100644
--- a/app/assets/javascripts/controllers/admin/calendar.js.erb
+++ b/app/assets/javascripts/controllers/admin/calendar.js.erb
@@ -486,7 +486,7 @@ Application.Controllers.controller('AdminCalendarController', ['$scope', '$state
  */
 Application.Controllers.controller('CreateEventModalController', ['$scope', '$uibModalInstance', '$sce', 'moment', 'start', 'end', 'machinesPromise', 'Availability', 'trainingsPromise', 'spacesPromise', 'tagsPromise', 'growl', '_t',
   function ($scope, $uibModalInstance, $sce, moment, start, end, machinesPromise, Availability, trainingsPromise, spacesPromise, tagsPromise, growl, _t) {
-  // $uibModal parameter
+    // $uibModal parameter
     $scope.start = start;
 
     // $uibModal parameter
@@ -553,6 +553,9 @@ Application.Controllers.controller('CreateEventModalController', ['$scope', '$ui
     // localized name(s) of the selected tag(s)
     $scope.tagsName = '';
 
+    // make the duration available for display
+    $scope.slotDuration = Fablab.slotDuration;
+
     /**
      * Adds or removes the provided machine from the current slot
      * @param machine {Object}
diff --git a/app/assets/templates/admin/calendar/eventModal.html.erb b/app/assets/templates/admin/calendar/eventModal.html.erb
index 3b7f245c1..b30bbf3b7 100644
--- a/app/assets/templates/admin/calendar/eventModal.html.erb
+++ b/app/assets/templates/admin/calendar/eventModal.html.erb
@@ -159,6 +159,7 @@
       <ul>
         <li ng-repeat="slot in occurrences">{{slot.start_at | amDateFormat:'L LT'}} - {{slot.end_at | amDateFormat:'LT'}}</li>
       </ul>
+      <div class="alert alert-warning" translate translate-values="{DURATION: slotDuration}"> {{ 'app.admin.calendar.divided_in_slots' }} </div>
       <div>
         <span class="underline" translate>{{ 'app.admin.calendar.reservable' }}</span>
         <span ng-bind-html="reservableName"></span>
diff --git a/config/locales/app.admin.fr.yml b/config/locales/app.admin.fr.yml
index 85917cec2..5015616a0 100644
--- a/config/locales/app.admin.fr.yml
+++ b/config/locales/app.admin.fr.yml
@@ -58,6 +58,7 @@ fr:
         select_nb_period: "Veuillez choisir un nombre de périodes pour la récurrence"
         select_end_date: "Veuillez choisir la date de dernière occurrence"
         about_to_create: "Vous vous apprêtez à créer {NUMBER, plural, one{le créneau} other{les créneaux}} {TYPE, select, machines{machine} training{formation} space{espace} other{autre}} suivant :"
+        divided_in_slots: "Ce créneau sera proposé à la réservation par tranches de {DURATION} minutes. Contactez votre administrateur système pour modifier ce paramètre."
         reservable: "Réservable(s) :"
         labels: "Étiquette(s) :"
         none: "Aucune"