diff --git a/app/coffee/app.coffee b/app/coffee/app.coffee
index ca511ea0..55a72905 100644
--- a/app/coffee/app.coffee
+++ b/app/coffee/app.coffee
@@ -157,6 +157,19 @@ configure = ($routeProvider, $locationProvider, $httpProvider, $provide, tgLoade
     $httpProvider.responseInterceptors.push('authHttpIntercept')
     $httpProvider.interceptors.push('loaderInterceptor');
 
+    window.checksley.updateValidators({
+        linewidth: (val, width) ->
+            lines = taiga.nl2br(val).split("<br />")
+
+            valid = _.every lines, (line) ->
+                line.length < width
+
+            return valid
+    })
+
+    window.checksley.updateMessages("default", {
+        linewidth: "The subject must have a maximum size of %s"
+    })
 
 init = ($log, $i18n, $config, $rootscope) ->
     $i18n.initialize($config.get("defaultLanguage"))
diff --git a/app/coffee/modules/common/lightboxes.coffee b/app/coffee/modules/common/lightboxes.coffee
index 72d4bcf8..ebc3093d 100644
--- a/app/coffee/modules/common/lightboxes.coffee
+++ b/app/coffee/modules/common/lightboxes.coffee
@@ -225,7 +225,9 @@ CreateBulkUserstoriesDirective = ($repo, $rs, $rootscope, lightboxService) ->
         $el.on "click", ".button-green", (event) ->
             event.preventDefault()
 
-            form = $el.find("form").checksley()
+            form = $el.find("form").checksley({
+                onlyOneErrorElement: true
+            })
             if not form.validate()
                 return
 
diff --git a/app/partials/views/modules/lightbox_add-bulk.jade b/app/partials/views/modules/lightbox_add-bulk.jade
index 2ec4d93e..606e68d8 100644
--- a/app/partials/views/modules/lightbox_add-bulk.jade
+++ b/app/partials/views/modules/lightbox_add-bulk.jade
@@ -3,6 +3,6 @@ a.close(href="", title="close")
 form
     h2.title(tg-i18n="common.new-bulk")
     fieldset
-        textarea(tg-i18n="placeholder:common.one-item-line", ng-model="new.bulk", data-required="true")
+        textarea(tg-i18n="placeholder:common.one-item-line", ng-model="new.bulk", data-required="true", data-linewidth="200")
     a.button.button-green(href="", tg-i18n="title:common.save")
         span(tg-i18n="common.save")