diff --git a/example56-context-timeout/main.go b/example56-context-timeout/main.go
index b06d5ef..210e2c0 100644
--- a/example56-context-timeout/main.go
+++ b/example56-context-timeout/main.go
@@ -14,6 +14,7 @@ func main() {
 		}
 	}()
 
+	// how to fix the timeout issue?
 	for {
 		select {
 		case val := <-output: