diff --git a/monetio/models/gocart.py b/monetio/models/gocart.py
index 9931fa2a..af7d52cc 100644
--- a/monetio/models/gocart.py
+++ b/monetio/models/gocart.py
@@ -1,4 +1,4 @@
-""" GOCART File Reader """
+"""GOCART File Reader."""
 
 import xarray as xr