diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4eaea8b..29ac814 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,6 @@
 cmake_minimum_required(VERSION 3.0.0)
 project(base16384 VERSION 2.0)
 SET(CMAKE_BUILD_TYPE "Release")
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=native")
 
 add_executable(base16384 base16384.c)
 
diff --git a/README.md b/README.md
index 8987e19..05d3ceb 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,15 @@ Save more space and since the code 0x0000 is encoded to "一", finding zero spac
 
 ## Usage 使用说明
 
+### Install from my PPA in Ubuntu 直接安装
+```bash
+sudo add-apt-repository ppa:fumiama/ppa
+sudo apt-get update
+sudo apt-get install base16384
+```
+
+### Build from source code 编译
+
 Clone this repo first.
 
 首先克隆该仓库。