diff --git a/progress.go b/progress.go
index 54e54e8..1a9dc9a 100644
--- a/progress.go
+++ b/progress.go
@@ -110,6 +110,7 @@
 }
 
 // Add creates a bar which renders itself by provided filler.
+// Set total to 0, if you plan to update it later.
 func (p *Progress) Add(total int64, filler Filler, options ...BarOption) *Bar {
 	if filler == nil {
 		filler = newDefaultBarFiller()