diff --git a/example56-context-timeout/main.go b/example56-context-timeout/main.go
index 210e2c0..f5601e0 100644
--- a/example56-context-timeout/main.go
+++ b/example56-context-timeout/main.go
@@ -5,7 +5,7 @@ import (
 )
 
 func main() {
-	output := make(chan int, 1)
+	output := make(chan int, 10)
 
 	go func() {
 		for i := 0; i < 30; i++ {
@@ -18,6 +18,8 @@ func main() {
 	for {
 		select {
 		case val := <-output:
+			// simulate slow consumer
+			time.Sleep(500 * time.Millisecond)
 			println("output:", val)
 		// how to fix the timeout issue?
 		case <-time.After(1 * time.Second):