diff --git a/pool.go b/pool.go
index 347f3f1..c2a51a0 100644
--- a/pool.go
+++ b/pool.go
@@ -96,6 +96,7 @@ func (p *Pool) GoCtx(ctx context.Context, task Task) {
 				task()
 			case <-idleTimer.C:
 				// worker exits
+				log.Printf("goroutine return...")
 				return
 			}