diff --git a/progress.go b/progress.go
index 45d12c4..0bd17bf 100644
--- a/progress.go
+++ b/progress.go
@@ -279,6 +279,8 @@
 		case <-renderReq:
 			err = s.render(w)
 			if err != nil {
+				// (*pState).(autoRefreshListener|manualRefreshListener) may block
+				// if not launching following short lived goroutine
 				go func() {
 					for {
 						select {