From d0674dc8368d636cfe844c043ed48a92b150b811 Mon Sep 17 00:00:00 2001
From: iamqizhao <toqizhao@gmail.com>
Date: Tue, 15 Dec 2015 17:36:03 -0800
Subject: [PATCH] add some comments

---
 picker_test.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/picker_test.go b/picker_test.go
index 70dae207..0ee789e6 100644
--- a/picker_test.go
+++ b/picker_test.go
@@ -184,6 +184,7 @@ func TestEmptyAddrs(t *testing.T) {
 		Op:   naming.Delete,
 		Addr: "127.0.0.1:" + servers[0].port,
 	})
+	// Wait until the first reading is done.
 	wg.Wait()
 	r.w.inject(updates)
 	ctx, _ := context.WithTimeout(context.Background(), 10*time.Millisecond)