diff --git a/uri.go b/uri.go
index c663728f8c..3bab3532ff 100644
--- a/uri.go
+++ b/uri.go
@@ -33,7 +33,7 @@ type URI interface {
 	fmt.Stringer
 
 	// Extension should return the file extension of the resource
-	// (including the dot) referenced by the URI. For example, the 
+	// (including the dot) referenced by the URI. For example, the
 	// Extension() of 'file://foo/bar.baz' is '.baz'. May return an
 	// empty string if the referenced resource has none.
 	Extension() string