diff --git a/README.md b/README.md
index c000831e..89f78831 100644
--- a/README.md
+++ b/README.md
@@ -1,99 +1,99 @@
-# 1. commit 规则
-- 每个人 fork 自己的 branch， 从自己的 branch 做 PR，review 完再 commit
-
-# 2. code format
-## 2.1. C
-推荐使用 clang-format，公共配置放在源码里面 xce/.clang-format
-
-（理论上直接使用源码里面 xce/.clang-format 文件格式不会变）
-
-### 2.1.1. vscode 可以在配置中加上如下内容
-```
-"C_Cpp.clang_format_style": "WebKit",
-"C_Cpp.clang_format_fallbackStyle": "WebKit",
-```
-
-### 2.1.2. vim & emacs
-
-clang-format -style="{BasedOnStyle: webkit}" -i  XX.c
-
-## 2.2. golang
-
-使用默认 gofmt
-
-# 3. build environment and build (example of ubuntu)
-## 3.1 build environment
- 
-- Install nix package management tool
-
-```sh
-sh <(curl -L https://nixos.org/nix/install) --daemon
-```
-
-- Edit /etc/nix/nix.conf to make sure
-
-```
-experimental-features = nix-command flakes
-sandbox = true
-sandbox-fallback = false
-substituters = https://mirrors.ustc.edu.cn/nix-channels/store https://cache.nixos.org https://cache.nixos.org/
-trusted-users = root <your account>
-```
-
-make sure that you have restarted nix-daemon service after you have checked /etc/nix/nix.conf
-
-- Install socat  and config ssh (for clone by ssh protocol) 
-
-```sh
-nix profile add nixpkgs#socat
-```
-
-.ssh/config
-```
-Host gitea.shenrs.eu
-	HostName gitea.shenrs.eu
-	IdentityFile ~/.ssh/id_ed25519
-	ProxyCommand socat - openssl-connect:gitea.shenrs.eu:2022,snihost=gitea.shenrs.eu,verify=0
-```
-
-## 3.2 checkout source code
-
-## 3.3 build (for package and release)
-
-```sh
-cd xce/src
-
-# for build debug version
-nix build --option sandbox false .#xce_debug
-
-# for normal build
-nix build --option sandbox false .#xce
-```
-
-You can find the generated binaries at =result= directory
-
-## 3.4 build (for daily develop)
-
-```sh
-cd xce/src
-nix develop
-
-# using meson to generated build configuration (debug and address sanitize)
-
-meson setup build --buildtype=debug -Db_sanitize=address
-
-# run meson to build
-meson compile -C  build
-
-# The generated files will be in build/
-```
-
-# 4. misc
-## 4.1. Windows remap ctrl and alt key
-create a reg file, e.g. remapkey.reg
-```
-Windows Registry Editor Version 5.00
-[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
-"Scancode Map"=hex:00,00,00,00,00,00,00,00,05,00,00,00,38,00,1d,00,1d,00,38,00,38,e0,1d,e0,1d,e0,38,e0,00,00,00,00
-```
-then double click remapkey.reg to import it. Restart OS.
+# 1. commit 规则
+- 每个人 fork 自己的 branch， 从自己的 branch 做 PR，review 完再 commit
+
+# 2. code format
+## 2.1. C
+推荐使用 clang-format，公共配置放在源码里面 xce/.clang-format
+
+（理论上直接使用源码里面 xce/.clang-format 文件格式不会变）
+
+### 2.1.1. vscode 可以在配置中加上如下内容
+```
+"C_Cpp.clang_format_style": "WebKit",
+"C_Cpp.clang_format_fallbackStyle": "WebKit",
+```
+
+### 2.1.2. vim & emacs
+
+clang-format -style="{BasedOnStyle: webkit}" -i  XX.c
+
+## 2.2. golang
+
+使用默认 gofmt
+
+# 3. build environment and build (example of ubuntu)
+## 3.1 build environment
+ 
+- Install nix package management tool
+
+```sh
+sh <(curl -L https://nixos.org/nix/install) --daemon
+```
+
+- Edit /etc/nix/nix.conf to make sure
+
+```
+experimental-features = nix-command flakes
+sandbox = true
+sandbox-fallback = false
+substituters = https://mirrors.ustc.edu.cn/nix-channels/store https://cache.nixos.org https://cache.nixos.org/
+trusted-users = root <your account>
+```
+
+make sure that you have restarted nix-daemon service after you have changed /etc/nix/nix.conf
+
+- Install socat  and config ssh (for clone by ssh protocol) 
+
+```sh
+nix profile add nixpkgs#socat
+```
+
+.ssh/config
+```
+Host gitea.shenrs.eu
+	HostName gitea.shenrs.eu
+	IdentityFile ~/.ssh/id_ed25519
+	ProxyCommand socat - openssl-connect:gitea.shenrs.eu:2022,snihost=gitea.shenrs.eu,verify=0
+```
+
+## 3.2 checkout source code
+
+## 3.3 build (for package and release)
+
+```sh
+cd xce/src
+
+# for build debug version
+nix build --option sandbox false .#xce_debug
+
+# for normal build
+nix build --option sandbox false .#xce
+```
+
+You can find the generated binaries at =result= directory
+
+## 3.4 build (for daily develop)
+
+```sh
+cd xce/src
+nix develop
+
+# using meson to generated build configuration (debug and address sanitize)
+
+meson setup build --buildtype=debug -Db_sanitize=address
+
+# run meson to build
+meson compile -C  build
+
+# The generated files will be in build/
+```
+
+# 4. misc
+## 4.1. Windows remap ctrl and alt key
+create a reg file, e.g. remapkey.reg
+```
+Windows Registry Editor Version 5.00
+[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
+"Scancode Map"=hex:00,00,00,00,00,00,00,00,05,00,00,00,38,00,1d,00,1d,00,38,00,38,e0,1d,e0,1d,e0,38,e0,00,00,00,00
+```
+then double click remapkey.reg to import it. Restart OS.