diff --git a/.travis/osx_runner.sh b/.travis/osx_runner.sh
index 48103c3..76b317a 100755
--- a/.travis/osx_runner.sh
+++ b/.travis/osx_runner.sh
@@ -43,7 +43,7 @@
     export_or_prefix
     export PATH=$OPENRESTY_PREFIX/nginx/sbin:$OPENRESTY_PREFIX/luajit/bin:$OPENRESTY_PREFIX/bin:$PATH
 
-    brew services start etcd
+    etcd --enable-v2=true &
     sleep 1
 
     luarocks install luacheck
diff --git a/README.md b/README.md
index 139e9ad..97a8d03 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,8 @@
 
 We will add support for Docker and more OS shortly.
 
+*NOTE*: APISIX currently only supports the v2 protocol storage to etcd, but the latest version of etcd (starting with 3.4) has turned off the v2 protocol by default. You need to add `--enable-v2=true` to the startup parameter to enable the v2 protocol. The development of the v3 protocol supporting etcd has begun and will soon be available.
+
 ### Install from RPM for CentOS 7
 
 ```shell
diff --git a/README_CN.md b/README_CN.md
index cd6a320..12b8f7a 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -76,6 +76,9 @@
 
 现在有两种方式来安装: 如果你是 CentOS 7 的系统，推荐使用 RPM 包安装；其他的系统推荐使用 Luarocks 安装。
 
+*NOTE*: APISIX 目前仅支持 etcd 的 v2 协议存储，但最新版的 etcd (3.4 开始）已经默认关闭 v2 协议。
+需要在启动参数中添加 `--enable-v2=true`，才能启用 v2 协议。支持 etcd 的 v3 协议开发工作已经开始，很快就能与大家见面。
+
 ### 通过 RPM 包安装（CentOS 7）
 
 ```shell