diff --git a/src/Geta.Optimizely.Categories/DataAnnotations/CategoriesAttribute.cs b/src/Geta.Optimizely.Categories/DataAnnotations/CategoriesAttribute.cs
index 275857d..162d8a5 100644
--- a/src/Geta.Optimizely.Categories/DataAnnotations/CategoriesAttribute.cs
+++ b/src/Geta.Optimizely.Categories/DataAnnotations/CategoriesAttribute.cs
@@ -42,6 +42,7 @@ public void CreateDisplayMetadata(DisplayMetadataProviderContext context)
             additionalValue.EditorConfiguration["repositoryKey"] = CategoryContentRepositoryDescriptor.RepositoryKey;
             additionalValue.EditorConfiguration["settings"] = categoryRepositoryDescriptor;
             additionalValue.EditorConfiguration["roots"] = categoryRepositoryDescriptor.Roots;
+            additionalValue.EditorConfiguration["multiple"] = true;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Geta.Optimizely.Categories/EditorDescriptors/CategoriesEditorDescriptor.cs b/src/Geta.Optimizely.Categories/EditorDescriptors/CategoriesEditorDescriptor.cs
index b748114..5a4de2b 100644
--- a/src/Geta.Optimizely.Categories/EditorDescriptors/CategoriesEditorDescriptor.cs
+++ b/src/Geta.Optimizely.Categories/EditorDescriptors/CategoriesEditorDescriptor.cs
@@ -41,8 +41,9 @@ public override void ModifyMetadata(ExtendedMetadata metadata, IEnumerable<Attri
             EditorConfiguration["repositoryKey"] = CategoryContentRepositoryDescriptor.RepositoryKey;
             EditorConfiguration["settings"] = categoryRepositoryDescriptor;
             EditorConfiguration["roots"] = categoryRepositoryDescriptor.Roots;
+            EditorConfiguration["multiple"] = true;
 
             base.ModifyMetadata(metadata, attributes);
         }
     }
-}
\ No newline at end of file
+}