diff --git a/spacy/tests/regression/test_issue1727.py b/spacy/tests/regression/test_issue1727.py
index f40b90c45..90256821b 100644
--- a/spacy/tests/regression/test_issue1727.py
+++ b/spacy/tests/regression/test_issue1727.py
@@ -1,3 +1,5 @@
+'''Test that models with no pretrained vectors can be deserialized correctly
+after vectors are added.'''
 from __future__ import unicode_literals
 import numpy
 from ...pipeline import Tagger