diff --git a/naming/etcd/etcd.go b/naming/etcd/etcd.go
index f9ee2759..915e2271 100644
--- a/naming/etcd/etcd.go
+++ b/naming/etcd/etcd.go
@@ -59,6 +59,7 @@ func (b *recvBuffer) get() <-chan *kv {
 	return b.c
 }
 
+// stop terminates the recvBuffer. After it is called, the recvBuffer is not usable any more.
 func (b *recvBuffer) stop() {
 	b.mu.Lock()
 	b.stopping = true