diff --git a/bigchaindb/backend/changefeed.py b/bigchaindb/backend/changefeed.py
index a3d9afd7..f42e5f71 100644
--- a/bigchaindb/backend/changefeed.py
+++ b/bigchaindb/backend/changefeed.py
@@ -1 +1 @@
-"""Changefeed interfaces for backend databases"""
+"""Changefeed interfaces for backend databases."""
diff --git a/bigchaindb/backend/query.py b/bigchaindb/backend/query.py
index 4b29274e..dfaa632e 100644
--- a/bigchaindb/backend/query.py
+++ b/bigchaindb/backend/query.py
@@ -1,4 +1,4 @@
-"""Query interfaces for backend databases"""
+"""Query interfaces for backend databases."""
 
 from functools import singledispatch