From 44f414469f51f1861e23e58505324041260e2691 Mon Sep 17 00:00:00 2001
From: zx <923137104@qq.com>
Date: Wed, 6 Jan 2021 14:00:45 +0800
Subject: [PATCH] update README

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 8600d0bd..587433f4 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
+# Note!
+Our recently developed planner [EGO-Swarm](https://github.com/ZJU-FAST-Lab/ego-planner-swarm) is an evolution from EGO-Planner. 
+It is more robust and safe, and therefore, is more recommended to use.
+If you have only one drone, just set the `drone_id` to `0` in EGO-Swarm's launch files.
+Of course, some topic names are changed from EGO-Planner, check it using `rqt_graph` and `rosnode info <package name>`.
+
 # Quick Start within 3 Minutes 
 Compiling tests passed on ubuntu **16.04, 18.04 and 20.04** with ros installed.
 You can just execute the following commands one by one.