diff --git a/app/server/api.py b/app/server/api.py
index 30d2aaea..a1c73c8d 100644
--- a/app/server/api.py
+++ b/app/server/api.py
@@ -87,7 +87,8 @@ class DocumentList(generics.ListCreateAPIView):
     serializer_class = DocumentSerializer
     filter_backends = (DjangoFilterBackend, filters.SearchFilter, filters.OrderingFilter)
     search_fields = ('text', )
-    ordering_fields = ('created_at', 'updated_at')
+    ordering_fields = ('created_at', 'updated_at', 'doc_annotations__updated_at',
+                       'seq_annotations__updated_at')
     filter_fields = ('doc_annotations__label__id', 'seq_annotations__label__id')
     permission_classes = (IsAuthenticated, IsProjectUser, IsAdminUserAndWriteOnly)
 
diff --git a/app/server/tests/test_api.py b/app/server/tests/test_api.py
index a2cddde2..d693985a 100644
--- a/app/server/tests/test_api.py
+++ b/app/server/tests/test_api.py
@@ -530,8 +530,12 @@ class TestSearch(APITestCase):
 
         cls.main_project = mixer.blend('server.Project', users=[project_member])
         cls.search_term = 'example'
-        mixer.blend('server.Document', text=cls.search_term, project=cls.main_project)
-        mixer.blend('server.Document', text='Lorem', project=cls.main_project)
+        doc1 = mixer.blend('server.Document', text=cls.search_term, project=cls.main_project)
+        doc2 = mixer.blend('server.Document', text='Lorem', project=cls.main_project)
+        label1 = mixer.blend('server.Label', project=cls.main_project)
+        label2 = mixer.blend('server.Label', project=cls.main_project)
+        mixer.blend('server.SequenceAnnotation', document=doc1, user=project_member, label=label1)
+        mixer.blend('server.SequenceAnnotation', document=doc2, user=project_member, label=label2)
 
         sub_project = mixer.blend('server.Project', users=[non_project_member])
         mixer.blend('server.Document', text=cls.search_term, project=sub_project)
@@ -564,6 +568,24 @@ class TestSearch(APITestCase):
         for d1, d2 in zip(response.data['results'], docs):
             self.assertEqual(d1['id'], d2['id'])
 
+    def test_can_order_doc_by_annotation_updated_at_ascending(self):
+        params = {'ordering': 'seq_annotations__updated_at'}
+        self.client.login(username=self.project_member_name,
+                          password=self.project_member_pass)
+        response = self.client.get(self.url, format='json', data=params)
+        docs = Document.objects.filter(project=self.main_project).order_by('seq_annotations__updated_at').values()
+        for d1, d2 in zip(response.data['results'], docs):
+            self.assertEqual(d1['id'], d2['id'])
+
+    def test_can_order_doc_by_annotation_updated_at_descending(self):
+        params = {'ordering': '-seq_annotations__updated_at'}
+        self.client.login(username=self.project_member_name,
+                          password=self.project_member_pass)
+        response = self.client.get(self.url, format='json', data=params)
+        docs = Document.objects.filter(project=self.main_project).order_by('-seq_annotations__updated_at').values()
+        for d1, d2 in zip(response.data['results'], docs):
+            self.assertEqual(d1['id'], d2['id'])
+
 
 class TestFilter(APITestCase):