diff --git a/stix2/sources/taxii.py b/stix2/sources/taxii.py
index 3d8dcaa..5dcd9f2 100644
--- a/stix2/sources/taxii.py
+++ b/stix2/sources/taxii.py
@@ -1,5 +1,5 @@
 """
-Python STIX 2.x 
+Python STIX 2.x
 Classes:
     TAXIICollectionStore
     TAXIICollectionSink