diff --git a/fetch.go b/fetch.go
index 9a71a32..98ebfb6 100644
--- a/fetch.go
+++ b/fetch.go
@@ -156,6 +156,8 @@ func (q *Queue) Block() {
 	<-q.done
 }
 
+// Done returns a channel that is closed when the Queue is closed (either
+// via Close or Cancel). Multiple calls always return the same channel.
 func (q *Queue) Done() <-chan struct{} {
 	return q.done
 }