diff --git a/unittests/test_data_model.py b/unittests/test_data_model.py
index 074239399002833e8500af6369f1b2c7bcc8a3ac..9be23c3188e3c3244112c4195c40ebd475f4d492 100644
--- a/unittests/test_data_model.py
+++ b/unittests/test_data_model.py
@@ -25,7 +25,7 @@ class DataModelTest(unittest.TestCase):
         assert "testproperty" in names
 
     # TODO this seems to require integration test
-    @pytest.mark.xfail
+    @pytest.mark.xfail(reason="This test will need an integration test. See issue #51")
     def test_get_existing_entities(self):
         db.RecordType(name="TestRecord").insert()
         c = db.Container().extend([
diff --git a/unittests/test_table_importer.py b/unittests/test_table_importer.py
index 51b4803d4db00f1b04fdfc4b78792e6a9de61bb8..60ca940b0471eaddf6e8c47b1cacbbfe90d22cac 100644
--- a/unittests/test_table_importer.py
+++ b/unittests/test_table_importer.py
@@ -64,7 +64,6 @@ class ConverterTest(unittest.TestCase):
             r"\this\computer,\this\computer"),
                          ["/this/computer", "/this/computer"])
 
-    @pytest.mark.xfail
     def test_datetime(self):
         test_file = os.path.join(os.path.dirname(__file__), "date.xlsx")
         self.importer = XLSImporter(converters={'d': datetime_converter,
@@ -165,7 +164,7 @@ class XLSImporterTest(unittest.TestCase):
         df_new = self.importer.check_unique(df)
         self.assertEqual(df_new.shape[0], 1)
 
-    @pytest.mark.xfail
+    @pytest.mark.xfail(reason="Wrong Error is raised. See Issue #52")
     def test_raise(self):
         tmp = NamedTemporaryFile(delete=False, suffix=".lol")
         tmp.close()