diff --git a/apps/tags/__init__.py b/apps/tags/__init__.py
index 2bfcb2f508..5263c3b240 100644
--- a/apps/tags/__init__.py
+++ b/apps/tags/__init__.py
@@ -66,4 +66,11 @@ class_permissions(Tag, [
     PERMISSION_TAG_VIEW,
 ])
 
+
+def flat_tags(document):
+    return u' '.join(document.tags.values_list('name', flat=True))
+
+
 Document.add_to_class('tags', TaggableManager())
+Document.add_to_class('flat_tags', flat_tags)
+