diff --git a/app/assets/javascripts/controllers/machines.coffee.erb b/app/assets/javascripts/controllers/machines.coffee.erb
index 524577b67..12af6cb96 100644
--- a/app/assets/javascripts/controllers/machines.coffee.erb
+++ b/app/assets/javascripts/controllers/machines.coffee.erb
@@ -742,7 +742,7 @@ Application.Controllers.controller "ReserveMachineController", ["$scope", "$stat
 
 
 
-    ##
+  ##
   # Triggered when fullCalendar tries to graphicaly render an event block.
   # Append the event tag into the block, just after the event title.
   # @see http://fullcalendar.io/docs/event_rendering/eventRender/
diff --git a/app/assets/templates/admin/coupons/_form.html.erb b/app/assets/templates/admin/coupons/_form.html.erb
index 2a5acddc5..37df00235 100644
--- a/app/assets/templates/admin/coupons/_form.html.erb
+++ b/app/assets/templates/admin/coupons/_form.html.erb
@@ -68,6 +68,10 @@
       <button type="button" class="btn btn-default" ng-click="toggleDatePicker($event)" ng-disabled="mode == 'EDIT'"><i class="fa fa-calendar"></i></button>
     </span>
   </div>
+
+  <span class="help-block text-info text-xs">
+      <i class="fa fa-lightbulb-o"></i> {{ 'leave_empty_for_no_limit' | translate }}
+    </span>
 </div>
 
 <div class="form-group" ng-class="{'has-error': couponForm['coupon[max_usages]'].$dirty && couponForm['coupon[max_usages]'].$invalid}">
@@ -79,6 +83,10 @@
          ng-disabled="mode == 'EDIT'"
          min="0"/>
   <span class="help-block error" ng-show="couponForm['coupon[max_usages]'].$dirty && couponForm['coupon[max_usages]'].$error.min" translate>{{ 'max_usages_must_be_equal_or_greater_than_0' }}</span>
+
+  <span class="help-block text-info text-xs">
+      <i class="fa fa-lightbulb-o"></i> {{ 'leave_empty_for_no_limit' | translate }}
+    </span>
 </div>
 
 <div class="form-group">
diff --git a/config/locales/app.shared.en.yml b/config/locales/app.shared.en.yml
index 4aec44532..34de8a913 100644
--- a/config/locales/app.shared.en.yml
+++ b/config/locales/app.shared.en.yml
@@ -345,6 +345,7 @@ en:
         forever: "Each use"
         validity_per_user_is_required: "Validity per user is required."
         valid_until: "Valid until (included)"
+        leave_empty_for_no_limit: "Do not specify any limit by leaving the field empty."
         max_usages: "Maximum usages allowed"
         max_usages_must_be_equal_or_greater_than_0: "The maximum usages allowed must be greater than 0."
         enabled: "Active"
diff --git a/config/locales/app.shared.fr.yml b/config/locales/app.shared.fr.yml
index 77fe39850..a6c7afc6f 100644
--- a/config/locales/app.shared.fr.yml
+++ b/config/locales/app.shared.fr.yml
@@ -345,6 +345,7 @@ fr:
         forever: "À chaque utilisation"
         validity_per_user_is_required: "La validité par utilisateur est requise."
         valid_until: "Valable jusqu'au (inclus)"
+        leave_empty_for_no_limit: "Laissez vide pour ne pas spécifier de limite."
         max_usages: "Nombre maximum d'utilisations autorisées"
         max_usages_must_be_equal_or_greater_than_0: "Le nombre d'utilisations maximum doit être supérieur ou égal à 0."
         enabled: "Activé"