diff --git a/openslides/agenda/static/js/agenda/base.js b/openslides/agenda/static/js/agenda/base.js
index e4be45c88..a399a6afd 100644
--- a/openslides/agenda/static/js/agenda/base.js
+++ b/openslides/agenda/static/js/agenda/base.js
@@ -369,9 +369,8 @@ angular.module('OpenSlidesApp.agenda', ['OpenSlidesApp.users'])
                          [{name: 'agenda/current-list-of-speakers-overlay',stable: true}]);
                 }
             },
-            isProjected: function (additionalId) {
+            isProjected: function () {
                 // Returns the id of the last projector with an agenda-item element. Else return 0.
-                // additionalId is not needed
                 var isProjected = 0;
                 var predicate = function (element) {
                     var value;
diff --git a/openslides/assignments/static/templates/assignments/assignment-detail.html b/openslides/assignments/static/templates/assignments/assignment-detail.html
index 1918e3d1a..f7290f495 100644
--- a/openslides/assignments/static/templates/assignments/assignment-detail.html
+++ b/openslides/assignments/static/templates/assignments/assignment-detail.html
@@ -163,7 +163,7 @@
         </button>
         <!-- Project -->
         <projector-button model="assignment" default-projector-id="defaultProjectorId"
-          additional-id="poll.id" content="{{ 'Project' | translate }}">
+          arg="poll.id" content="{{ 'Project' | translate }}">
         </projector-button>
       </div>
 
diff --git a/openslides/core/static/js/core/base.js b/openslides/core/static/js/core/base.js
index f4d263298..d25109b26 100644
--- a/openslides/core/static/js/core/base.js
+++ b/openslides/core/static/js/core/base.js
@@ -320,11 +320,11 @@ angular.module('OpenSlidesApp.core', [
  * This places a projector button in the document.
  *
  * Example: <projector-button model="motion" default-projector.id="defPrId"
- *           additional-id="2" content="{{ 'project' | translate }}"></projector-button>
+ *           arg="2" content="{{ 'project' | translate }}"></projector-button>
  * This button references to model (in this example 'motion'). Also a defaultProjectionId
  * has to be given. In the example it's a scope variable. The next two parameters are additional:
- *   - additional-id: Then the model.project and model.isProjected will be called with
- *                    this argument (e. g.: model.project(2))
+ *   - arg: Then the model.project and model.isProjected will be called with
+ *          this argument (e. g.: model.project(2))
  *   - content: A text placed behind the projector symbol.
  */
 .directive('projectorButton', [
@@ -350,9 +350,9 @@ angular.module('OpenSlidesApp.core', [
                     scope.defaultProjectorId = defaultProjectorId;
                 });
 
-                if (attributes.additionalId) {
-                    scope.$watch(attributes.additionalId, function (id) {
-                        scope.additionalId = id;
+                if (attributes.arg) {
+                    scope.$watch(attributes.arg, function (arg) {
+                        scope.arg = arg;
                     });
                 }
 
diff --git a/openslides/core/static/templates/projector-button.html b/openslides/core/static/templates/projector-button.html
index 49415430e..91240dfab 100644
--- a/openslides/core/static/templates/projector-button.html
+++ b/openslides/core/static/templates/projector-button.html
@@ -1,24 +1,24 @@
 <div class="btn-group" style="min-width:{{ projectors.length > 1 ? '54' : '34' }}px;" uib-dropdown
-  uib-tooltip="{{ 'Projector' | translate }} {{ model.isProjected(additionalId) }}"
-  tooltip-enable="model.isProjected(additionalId) > 0"
+  uib-tooltip="{{ 'Projector' | translate }} {{ model.isProjected(arg) }}"
+  tooltip-enable="model.isProjected(arg) > 0"
   os-perms="core.can_manage_projector">
   <button type="button" class="btn btn-default btn-sm"
-    ng-click="model.project(defaultProjectorId, additionalId)"
-    ng-class="{ 'btn-primary': model.isProjected(additionalId) == defaultProjectorId }">
+    ng-click="model.project(defaultProjectorId, arg)"
+    ng-class="{ 'btn-primary': model.isProjected(arg) == defaultProjectorId }">
     <i class="fa fa-video-camera"></i>
     {{ content }}
   </button>
   <button type="button" class="btn btn-default btn-sm slimDropDown"
-    ng-class="{ 'btn-primary': (model.isProjected(additionalId) > 0 && model.isProjected(additionalId) != defaultProjectorId) }"
+    ng-class="{ 'btn-primary': (model.isProjected(arg) > 0 && model.isProjected(arg) != defaultProjectorId) }"
     ng-if="projectors.length > 1"
     uib-dropdown-toggle>
     <span class="caret"></span>
   </button>
   <ul class="dropdown-menu">
     <li role="menuitem" ng-repeat="projector in projectors">
-      <a href="" ng-click="model.project(projector.id, additionalId)"
-        ng-class="{ 'projected': (model.isProjected(additionalId) == projector.id) }">
-        <i class="fa fa-video-camera" ng-show="model.isProjected(additionalId) == projector.id"></i>
+      <a href="" ng-click="model.project(projector.id, arg)"
+        ng-class="{ 'projected': (model.isProjected(arg) == projector.id) }">
+        <i class="fa fa-video-camera" ng-show="model.isProjected(arg) == projector.id"></i>
         {{ projector.name }}
         <span ng-if="defaultProjectorId == projector.id">(<translate>Default</translate>)</span>
       </a>