diff --git a/repo2docker/buildpacks/docker.py b/repo2docker/buildpacks/docker.py
index 9185307a..ae49bf7f 100644
--- a/repo2docker/buildpacks/docker.py
+++ b/repo2docker/buildpacks/docker.py
@@ -1,5 +1,4 @@
-"""Generates a variety of Dockerfiles based on an input matrix
-"""
+"""Generates a variety of Dockerfiles based on an input matrix"""
 
 import os