diff --git a/etcdserver/v3_server.go b/etcdserver/v3_server.go
index cff46d57f..d8f2b8a7d 100644
--- a/etcdserver/v3_server.go
+++ b/etcdserver/v3_server.go
@@ -646,7 +646,7 @@ func (s *EtcdServer) linearizableReadLoop() {
 				}
 
 			case <-time.After(s.Cfg.ReqTimeout()):
-				plog.Warningf("timed out waiting for read index response")
+				plog.Warningf("timed out waiting for read index response (local node might have slow network)")
 				nr.notify(ErrTimeout)
 				timeout = true
 				slowReadIndex.Inc()