diff --git a/bar.go b/bar.go
index d070a2c..b25e5e4 100644
--- a/bar.go
+++ b/bar.go
@@ -30,6 +30,8 @@
 	done         chan struct{}
 }
 
+// Statistics represents statistics of the progress bar
+// instance of this, sent to DecoratorFunc, as param
 type Statistics struct {
 	Total, Current                   int
 	TimeElapsed, TimePerItemEstimate time.Duration