diff --git a/stix2/datastore/__init__.py b/stix2/datastore/__init__.py
index 561fe9e..57cb513 100644
--- a/stix2/datastore/__init__.py
+++ b/stix2/datastore/__init__.py
@@ -420,7 +420,7 @@ class CompositeDataSource(DataSource):
     """Controller for all the attached DataSources.
 
     A user can have a single CompositeDataSource as an interface
-    the a set of DataSources. When an API call is made to the
+    to a set of DataSources. When an API call is made to the
     CompositeDataSource, it is delegated to each of the (real)
     DataSources that are attached to it.